Alan Ritchson packed on 35 pounds of muscle to play Jack Reacher, transforming from a lean 205 lbs into one of the most physically imposing actors on television. He did it with short, high-intensity sessions, never more than 30 minutes, built on a strict five-day bodybuilding split.
Ritchson has played Reacher across three seasons and continues to train year-round to maintain the size and strength the role demands. His approach favors consistency and longevity over chasing heavy PRs or grinding through two-hour gym marathons.
Below is a full breakdown of his training split, exercises, rep ranges, pre-workout protocol, and the supplement stack he credits for making his Reacher transformation possible.
Training Philosophy
Ritchson trains for function, longevity, and the ability to perform physically demanding roles well into his 40s. He has been clear that he is not chasing powerlifting numbers or bodybuilder stage condition.
"I want to be 100 years old and still playing Reacher."
His sessions run 20 to 30 minutes, built around supersets and back-to-back movements that keep his heart rate elevated throughout. He uses the 15 to 25 rep range almost exclusively, treating hypertrophy as the primary goal of every session.
"I almost never do less than 15 reps. Hypertrophy, to me, sort of begins at 15 and kind of ends at 25."
He does not train to failure and does not chase personal records. The goal is consistent, progressive effort that compounds over months and years.
"To the guys always asking for workout tips. I'm no expert.
I'm never where I want to be. I'm grinding it out just like you.
Move something that fatigues your body and heart most days of the week."
Weekly Training Split
| Day | Focus |
|---|---|
| Monday | Chest |
| Tuesday | Back |
| Wednesday | Shoulders |
| Thursday | Arms (Biceps and Triceps) |
| Friday | Legs |
| Saturday | Full Body or Active Rest |
| Sunday | Rest |
Each session opens with a 15-minute Stairmaster warmup before any weights are touched. This raises core temperature, activates the cardiovascular system, and primes the joints for high-rep work.
Chest Day (Monday)
Chest day is built around 90 total pressing reps split evenly across three bench angles. Ritchson uses the Smith Machine for all three presses, preferring the controlled path it provides for consistent form at high rep counts.
| Exercise | Sets | Reps |
|---|---|---|
| Stairmaster Warmup | 1 | 15 min |
| Smith Machine Incline Press | 3 | 10 |
| Smith Machine Flat Press | 3 | 10 |
| Smith Machine Decline Press | 3 | 10 |
| Cable Flyes | 3 | 15-20 |
| Push-Ups to Failure | 2 | Failure |
Cable flyes follow the pressing work to stretch and isolate the pectoral muscle under load. The session closes with bodyweight push-ups taken to failure, a throwback to the calisthenics foundation he built before landing the Reacher role.
Back Day (Tuesday)
Back day opens with pull-ups, which Ritchson treats as a non-negotiable anchor exercise. He performs four grueling sets to failure before moving into weighted cable and machine movements.
| Exercise | Sets | Reps |
|---|---|---|
| Stairmaster Warmup | 1 | 15 min |
| Pull-Ups to Failure | 4 | Failure |
| Cable Rows | 4 | 15-20 |
| Lat Pulldowns | 3 | 15-20 |
| Seated Cable Row (Wide Grip) | 3 | 15-20 |
| Dumbbell Rows | 3 | 15 each |
The wide back Ritchson carries on screen comes from this consistent pull-focused training. Cable rows and lat pulldowns give him the volume needed to develop that V-taper without heavy barbell lifting that strains the lower back.
Shoulder Day (Wednesday)
Shoulders are trained with a combination of compound pressing and isolation work to build the capped, three-dimensional look that makes Ritchson's frame so visually imposing. Arnold presses are a staple, hitting all three deltoid heads through a full range of motion.
| Exercise | Sets | Reps |
|---|---|---|
| Stairmaster Warmup | 1 | 15 min |
| Arnold Press | 4 | 15-20 |
| Seated Dumbbell Shoulder Press | 3 | 15-20 |
| Cable Lateral Raise | 4 | 15-20 |
| Front Dumbbell Raise | 3 | 15 |
| Face Pulls | 3 | 20-25 |
Face pulls appear at the end of the session to protect the rotator cuff and build rear deltoid thickness. This is particularly important for someone training five days a week with heavy overhead pressing volume.
Arms Day (Thursday)
Arms day is built almost entirely around supersets. Ritchson pairs tricep and bicep movements back-to-back with minimal rest, keeping intensity high within the 30-minute window.
| Exercise | Sets | Reps |
|---|---|---|
| Stairmaster Warmup | 1 | 15 min |
| Tricep Pushdowns (superset) | 4 | 15-25 |
| Overhead Tricep Extensions (superset) | 4 | 15-25 |
| Hammer Curls | 4 | 15-20 |
| Barbell Curls | 3 | 15-20 |
| Dips to Failure | 2 | Failure |
Tricep pushdowns are supersetted directly with overhead extensions before moving to hammer curls. The superset structure reflects his roots in calisthenics, where back-to-back effort was the default rather than the exception.
Leg Day (Friday)
Leg day uses the leg press as its primary compound movement rather than barbell squats. This lets Ritchson load the quads and glutes with high volume while minimizing spinal compression that could carry over into upper body sessions.
| Exercise | Sets | Reps |
|---|---|---|
| Stairmaster Warmup | 1 | 15 min |
| Leg Press | 4 | 15-25 |
| Leg Extension | 4 | 15-20 |
| Leg Curl | 4 | 15-20 |
| Standing Calf Raises | 4 | 20-25 |
| Seated Calf Raises | 3 | 20-25 |
Calf raises appear twice at the end of leg day, a nod to the fact that calves are notoriously difficult to develop and respond better to high frequency and volume. Ritchson gives them serious attention rather than treating them as an afterthought.
Pre-Workout Protocol
Ritchson kicks off every session with 15 minutes on the Stairmaster before touching a single weight. This is not a casual warmup.
He treats it as a mandatory primer that elevates his heart rate, lubricates his joints, and mentally locks him into the work ahead.
His pre-session stack includes performance electrolytes and trace minerals, which he credits as a game-changer in his daily energy and workout quality. He starts his mornings with these supplements and calls them non-negotiable.
He also takes methylcobalamin B12, which a genetic test revealed he was deficient in. The B12 addition had a noticeable impact on his energy levels and training capacity, and it has remained a permanent fixture in his morning stack.
Post-Workout Recovery
Ritchson trains five to six days a week, which means recovery is not optional. It is part of the program.
He incorporates sauna sessions after training to accelerate blood flow to worked muscles and speed the repair process.
His protein target is 300 grams per day from whole food sources like chicken, turkey, fish, eggs, and rice. He supplements with protein powder to hit that number on training days without overeating.
Sleep is treated as the highest-leverage recovery tool. Ritchson prioritizes full nights of sleep and views it as part of the training program, not separate from it.
The System
The Ritchson system works because it removes every variable that gets in the way of consistency. Sessions are capped at 30 minutes, which means there is no excuse not to show up.
The Stairmaster warmup is fixed. The rep ranges are fixed.
The split is fixed.
He built his original physique on calisthenics alone. Running to a park, hitting 100 reps each of push-ups, pull-ups, dips, and sit-ups, then running home.
When Reacher demanded something bigger, he layered structured bodybuilding on top of that athletic base and ate 4,500 calories a day to fuel the growth.
The lesson is not to copy his exact calorie target or supplement stack. It is to show up five days a week, work in the 15 to 25 rep range with genuine effort, eat enough protein, and recover seriously.
That is the system that added 35 pounds of muscle to one of Hollywood's most recognizable action stars.
Explore Similar Routines
Around the core training fuel, Ritchson treats two morning add-ons as non-negotiable: performance electrolytes and trace minerals he credits as a game-changer for daily energy and workout quality, and methylcobalamin B12 he added after a genetic test flagged a deficiency, a permanent fixture in his stack ever since.