How to Periodize Strength Training: Walt Cline System

Based on Episode 90 of the Just Fly Performance Podcast, a conversation between host Joel Smith and sport performance coach Walt Cline.

Ask a strength coach how to periodize strength training and you usually get a wall of jargon: macrocycles, mesocycles, accumulation and intensification blocks. Walt Cline answers the same question with four colors. A sport performance coach and consultant who has spent decades programming for scholastic, collegiate, and professional athletes, Cline built a red, white, blue, and gold zone system so any athlete can see at a glance which energy system a workout trains and what comes next. In this episode he walks through how the zones fit together, how he matches weight-room work to the track, and how he sequences all of it across a season.

Key Takeaways

• Periodize by matching energy systems. The weight room should train the same quality the athlete is working on the track or field that day, so lifting and speed work potentiate each other.
• Four color zones keep it simple. Red is strength endurance and work capacity, white is maximal strength, blue is rate of force development, gold is the taper.
• Block and undulating both work. Solid-color weeks in the off-season, rotate red, white, and blue within a week once athletes are competing.
• Cluster sets, zoned by rest. Ten seconds between reps in red, 20 in white, 30 in blue, plus a “backup rule” that lets an athlete still finish the prescription on a bad day.
• “Three sets of ten” means nothing by itself. Change only the load and the rest and the same set-and-rep scheme trains three different energy systems.

The red, white, blue, and gold zone system

Cline’s whole method rests on four color-coded intensity zones, and he is candid about where the idea came from: he needed to communicate intensity to people who were not sport scientists.

This color coding was the end result of a military project I had ten years ago with the US Marine Corps and Navy Research, and I needed a way to communicate the intensity of things to people that did not have multiple degrees in sport sciences. I needed them to be able to keep an order so they knew what was next.

The order is the point. Red is the base: strength endurance, work capacity, hypertrophy, high volume at low load, the day athletes dread. It is also where athletes learn to lift, which is a second reason Cline puts it first.

They’re not good at these exercises yet. They need practice, and you don’t want them practicing the exercises with heavy loads. They’re gonna get hurt that way. So use body weight and bands and do high repetition efforts and eccentric holds and isometric holds. It’s a skill. I don’t know if everyone thinks about strength training as a skill.

White shifts gears to submaximal and maximal strength, heavier loads, much more rest. Blue is the fast day.

Blue zone is speed-strength, power, or dynamic. This is where rate of force development is the most important. This zone’s all about going real fast.

Gold is used sparingly for peaking, unloading, and taper, which he describes as blue with a lot more rest and a lot less volume. He teaches the sequence to athletes almost as a call and response: “We always want red, white, and blue to win gold.” The colors turn an abstract intensity prescription into something an athlete can see on a card and remember.

Matching the weight room to track and field energy systems

The engine underneath the colors is energy-system matching. Cline does not treat the weight room and the track as separate projects; he aligns them so both train the same quality on the same day.

In the weight room, what I try to do is match up the energy systems. If I have a guy working on strength endurance on the field or on the track, I want to match that up with their efforts in the weight room. Same thing with maximal strength. If we’re tapering down and working on best performances, race pace, trying to be very explosive and really test our times, we’re doing something similar in the weight room. We’re training to the energy system.

So a strength-endurance day on the track (say, repeated 30-meter runs under a target time) pairs with red-zone lifting, a maximal day on the track pairs with heavy white-zone work, and an explosive race-pace day pairs with blue. The athlete’s whole training day pulls in one direction instead of sending mixed signals to the same physiology.

Block weeks or rotating zones: two ways to periodize

Cline uses the same four colors two different ways, and he does not treat one as superior. In the off-season he will run blocked, solid-color weeks.

One whole week of red, one whole week of white, one whole week of blue. I’ll also use two weeks of white, two weeks of red, or two weeks of red, two weeks of white, two weeks of blue.

Once athletes are competing, he prefers to undulate the zones inside a single week, especially for team sports with weekend games.

For team sports, when they compete on the weekends, I’m a big fan of red, white, red, white, and blue in a week. I see better engagement from the athletes. It seems to help minimize their stiffness and soreness very well.

The engagement is not only about soreness. Cline puts the dreaded red days right before a heavier white day athletes look forward to, and the order itself pulls more genuine effort out of them.

When they know their next workout is a white workout and they’re gonna be able to pick up some heavier loads, I get them to go after those red days. I get more effort out of them because they know it’s only gonna be for these couple of days, and then it’s gonna get better. They’re not cheating their rest.

He also lets the calendar make the call for him. A congested exam week or a blown-up schedule becomes a reason to slot in a gold week, “because stress is stress, and it adds up.” His guiding frame is what he calls the five motor abilities, arranged like a star: work capacity, strength, power, mobility, and balance and skill. “There’s really no points in that star that you can take away,” so within any cycle he wants to touch all of them, with one as the main focus. That is the real reason he rotates the colors instead of spending a month on a single quality: every cycle has to keep all five points of the star alive.

Periodizing strength through the competitive season

The in-season problem is keeping qualities alive without breaking athletes down, and this is where the color system earns its keep. Cline shared the actual zone calendar he ran with a state-champion high school baseball team.

Red, red, white, blue, red, white, white, blue, red, white, blue, blue, red, white, blue, gold, playoffs. Hopefully a championship.

Read it as a story: build a base, sharpen strength, express power, revisit the base, and step the emphasis toward speed and power as the season goes, then drop into gold to peak for the playoffs. The gold week does double duty as a discipline tool for athletes who do not know how to back off.

I’ve had a lot of athletes that work so hard in the off-season, that’s what they know. When they start coming up to a tapering time, they feel weird, like they’re not getting what they need if they don’t go work out hard. This holds them to that structure. Back off a little bit and let your body heal, because we’re saving you for a performance.

Cluster set rules for every zone

Cluster sets run through the whole system, and Cline zones them by inter-rep rest so athletes always know the rule.

In the red zone, I control the inner repetition resting level at 10 seconds. In white zone, 20 seconds, and in blue zone, 30 seconds. I make that a standard so they know when we do cluster sets, that’s the amount of time to take between their reps.

In red the clusters build volume and teach the movement: “I call it red cluster, where they bang out 25 reps, five at a time, and they keep their load very low, something between 30% to 50%.” In white and blue the purpose flips from surviving to producing force.

Muscles can’t contract explosively unless they’re rested, so any time I’m working on a more brisk or explosive movement, that’s usually when I’m using some type of cluster set.

He also uses a cluster “backup rule” so a tired or under-recovered athlete can still complete the prescription. If the card says three sets of ten and they stall, “they may do seven, and then three ones, as long as the pause between those ones was 10 seconds. You can still check the box. It still counts.” The athlete gets the intended work without grinding failed reps.

Isometrics and contrast sets to prime the nervous system

Potentiation is where Cline lets the zones bleed into each other on purpose. He pairs a heavy or maximal effort with an explosive one to borrow the nervous-system charge.

Take an athlete and have them move a heavy load, maybe a quarter squat, maybe a mid-thigh pull, and then take that effect within three to five minutes, line up and blast out and execute your start steps or your push steps. Some kids are like, “Wow, my push steps feel amazing today.” That’s not by accident.

When he wants the charge without the heavy load, or has no weight room at the track, he reaches for an isometric.

Something simple like a mid-thigh pull for five to 10 seconds, a maximal approach, an immovable object type thing. They’re pushing with their feet into the ground hard, recruiting an incredible amount of motor units.

He grounds the choice in force-production research, noting that the second pull of an Olympic clean produced far more power in the studies he cites than a bench or squat, “because you’re recruiting so much muscle mass.” The goal is not just the physical effect but the athlete’s awareness of it: “jazz up the nervous system so I can get a little bit more out of it, and also get the kid to understand that they have that in them.”

Why “three sets of ten” tells you nothing

Cline’s sharpest recurring point is that the most common prescription in strength training is empty without a load and a rest interval attached.

Three sets of ten is, I have no idea what you mean when you say three sets of ten. Three sets of ten with 65% to 70% of your max? A white zone approach, I take those ten reps and cut them down to five and put 85% on there with a whole lot more rest. In the blue zone, I can use three sets of ten again, but now I want them to do ten singles, and go as fast as possible with a lot of rest.

Same numbers on the whiteboard, three completely different workouts.

Three different energy systems for three different reasons, with three different action speeds, three different rest intervals, and three completely different themes.

That is the whole argument for zoning intensity by color instead of by set-and-rep scheme. It also reflects how Cline thinks about every fashionable method a coach is tempted to add: the question is never simply whether it works, but where it fits. “Where does it go? Where is its place? Because I have a difficult time answering ‘what’s the best thing to do?’ Well, for who? And in which period? And for what sport?”

Frequently asked questions

What is the difference between block and undulating periodization?
Block periodization holds one quality for a stretch of time (Cline runs solid-color weeks, or even two-week blocks, of red, then white, then blue), while undulating periodization rotates the qualities inside a single week. He tends to block in the off-season and undulate (red, white, red, white, blue) in-season for team sports.

How do you periodize strength training in season?
Cline rotates his color zones week to week or within a week to keep every quality alive, steps the emphasis toward speed and power as competition nears, and drops in a gold (taper) week to peak for playoffs, using it partly to force hard-working athletes to back off.

How do you match weight room training to speed work?
Train the same energy system in both places on the same day: strength-endurance track work pairs with red-zone lifting, maximal track days pair with heavy white-zone work, and explosive race-pace days pair with blue-zone power work.

Should you train strength endurance and max strength in the same week?
Yes, in Cline’s model both live in the rotation. He often orders them red then white then blue so the base strength-endurance work potentiates the heavier and faster days that follow, rather than training a single quality in isolation.

What are cluster sets and how do you program the rest?
Cluster sets break a set into mini-sets with short intra-set rest. Cline standardizes that rest by zone: 10 seconds in red, 20 in white, 30 in blue, using longer rest in the faster zones so the athlete stays fresh enough to produce force.

About the authors

Walt Cline is a sport performance coach and consultant and the founder of a color-coded intensity-zone training system. He has coached football and track and field at the college level and has worked with thousands of scholastic, collegiate, and professional athletes across a range of sports.

Joel Smith is the host of the Just Fly Performance Podcast and the founder of Just Fly Sports, a former collegiate strength and track and field coach focused on speed, power, and athletic development. Listen to the full episode with Walt Cline on Just Fly Sports.