Shortcut to Size Workout Program

Origin & Philosophy

Shortcut to Size was created by Jim Stoppani, PhD, an exercise physiologist who served as the senior science editor for Muscle & Fitness magazine. Originally published on Bodybuilding.com, the program has been completed by hundreds of thousands of trainees and remains one of the most popular beginner-to-intermediate hypertrophy programs online.

The core principle is weekly undulating periodization (WUP) - changing rep ranges each week within a repeating 4-week cycle. Week 1 uses 12-15 reps (muscular endurance and metabolic stress), week 2 drops to 9-11 (hypertrophy sweet spot), week 3 goes to 6-8 (strength-hypertrophy), and week 4 hits 3-5 (maximal strength). This exposes muscles to different stimuli every week, which research shows produces better long-term strength and size gains than straight-set training at the same rep range.

The program runs three identical 4-week cycles (phases 1-3), but swaps out accessory exercises between phases. This provides exercise variety where it matters (different angles and loading patterns) while keeping the primary lifts constant for consistent tracking and progressive overload.

Who It's For

• Experience level: Beginner to intermediate (3-12+ months of gym experience). You should know basic barbell and dumbbell form but don't need advanced lifting technique.
• Primary goal: Hypertrophy with strength as a secondary benefit.
• Best suited for: Bulking or maintenance phases. The high volume and 4-day frequency require adequate caloric intake for recovery.

Pros & Cons

Pros

• Weekly rep range changes keep training varied and prevent monotony - you never do the same rep scheme two weeks in a row
• Anchor exercises stay constant for 12 weeks, making progressive overload easy to track
• Accessory rotation between phases hits muscles from different angles without overcomplicating the week-to-week structure
• 4 days per week is sustainable for most schedules while providing enough volume per muscle group
• High volume of direct arm work - 3 exercises each for biceps and triceps on their respective days

Cons

• Chest/Triceps and Back/Biceps days have 9-10 exercises each and run 90-120 minutes - plan your schedule accordingly
• No programmed deload weeks, though the high-rep week (12-15) at the start of each phase serves as a relative intensity reset
• The program uses several cable and machine exercises that require a commercial gym - not ideal for home gym setups
• No compound pulling movement like Deadlift - back work is limited to rows and pulldowns
• No direct ab work in the original program's core rotation translates perfectly - the ab exercises here are simplified from the original weekly rotation

Program Structure

• Split: Body part split - Chest/Triceps/Calves, Back/Biceps/Abs, Shoulders/Traps/Calves, Legs/Abs
• Periodization: Weekly undulating periodization (WUP) within 4-week blocks, with exercise rotation between blocks
• Schedule: Fixed weekly - Mon/Tue/Thu/Fri with Wednesday and weekends off
• Cycle length: 12 weeks (three 4-week phases)
• Typical week: Chest/Triceps/Calves -> Back/Biceps/Abs -> Rest -> Shoulders/Traps/Calves -> Legs/Abs -> Rest -> Rest

Exercise Selection & Rationale

Anchor exercises (constant across all 12 weeks): Bench Press is the primary chest compound. Bent Over Row, Dumbbell drives back thickness with unilateral loading. Shoulder Press is the core deltoid press. Squat is the primary lower body compound. Bicep Curl, Barbell and Triceps Pushdown are the lead isolation movements for arms. Romanian Deadlift, Barbell anchors hamstring work. These movements stay consistent for tracking and progressive overload.

Phase 1 accessories establish the baseline. Incline Bench Press targets upper chest. Incline Chest Fly adds a stretch-focused chest movement. Cable Crossover provides constant tension through the full range. Skullcrusher hits triceps at a long muscle length. Triceps Extension, Cable (overhead) targets the long head. Lat Pulldown builds back width. Incline Curl puts the biceps in a stretched position.

Phase 2 rotates accessories to new angles. Incline Bench Press, Dumbbell replaces barbell incline for more range of motion. Chest Fly moves to flat. Incline Chest Fly, Cable provides a cable-based chest stretch. Triceps Extension switches to overhead dumbbell. Seated Row adds horizontal pulling. Preacher Curl replaces incline curls to emphasize the short head of the biceps. Front Squat replaces leg press for more quad emphasis.

Phase 3 introduces final rotations. Cable Crossover returns. Bench Press Close Grip replaces one of the cable triceps exercises for heavier loading. Concentration Curl adds peak contraction work. Leg Press returns. Upright Row and Lateral Raise rotate back in for shoulders.

Calves are trained twice per week with two exercises each session - Standing Calf Raise targets the gastrocnemius and Seated Calf Raise targets the soleus. Calves use higher rep ranges than other muscle groups (25-30 down to 6-9).

Abs appear twice per week with 3 exercises per session. The original program rotates ab exercises weekly through progressively heavier variations. This implementation simplifies that to a fixed selection with rep ranges matching the weekly periodization.

Substitution options: Cable Crossover -> Chest Fly or Pec Deck. Lat Pulldown -> Pull Up or Chin Up. Triceps Pushdown -> Triceps Dip. Leg Press -> Bulgarian Split Squat. Leg Extension -> Goblet Squat. Lying Leg Curl / Seated Leg Curl -> additional Romanian Deadlift, Barbell sets. Seated Calf Raise -> Calf Press on Leg Press.

Set & Rep Scheme

The program uses four distinct rep ranges that cycle weekly within each 4-week phase:

• Week 1 of each phase (weeks 1, 5, 9): 12-15 reps for main exercises, 25-30 reps for calves, 15-20 reps for abs
• Week 2 of each phase (weeks 2, 6, 10): 9-11 reps, 15-20 reps for calves, 12-15 reps for abs
• Week 3 of each phase (weeks 3, 7, 11): 6-8 reps, 10-14 reps for calves, 10-14 reps for abs
• Week 4 of each phase (weeks 4, 8, 12): 3-5 reps for maximal strength, 6-9 reps for calves, 6-9 reps for abs

Primary exercises get 4 working sets, accessories get 3 working sets. All main and accessory exercises use RPE 8 (2 reps in reserve) to auto-calculate weight from your 1RM. This is an adaptation for the app - the original program simply prescribes "pick a weight that causes failure within the rep range." RPE 8 achieves the same intent while giving you a concrete starting weight.

Example of Bench Press sets/reps/weight week over week

The program includes two intensity techniques from the original "Maximize Muscle Growth" focus:

• Rest-pause (weeks 1-2 of each phase): The last working set is followed by a 15-second rest and one more set at the same weight. This adds metabolic stress during the higher-rep weeks.
• Drop sets (weeks 3-4 of each phase): After completing the last working set, one additional set is added at 75% of the working weight. This extends time under tension during the heavier weeks.

Progressive Overload

This implementation bumps your 1RM by 5lb (10lb for Squat and Romanian Deadlift, Barbell) at the end of each 4-week phase, provided you completed all reps on the final week. Since weights are derived from RPE and 1RM, bumping the 1RM proportionally increases weights across all rep ranges for the next phase.

The progression fires at the end of weeks 4 and 8 (the heavy 3-5 rep weeks). If you hit at least the minimum of your rep range on all sets, your 1RM goes up for the next phase. If you miss reps, the 1RM stays the same - you get another shot in the next phase.

Calves and abs don't use auto-progression - adjust weights manually as needed.

When you stall: The weekly undulation means true stalls are uncommon. If you consistently miss the 3-5 rep week, your 1RM may be set too high - reduce it by 5-10% in the app.

How Long to Run It / What Next

Run for exactly 12 weeks as designed. You can repeat the full 12-week cycle - the 1RM bumps carry over, so you'll be lifting heavier in the next cycle. After 2-3 cycles (24-36 weeks), consider transitioning to a program with more structured periodization.

Transition to: PHUL if you want an upper/lower split with dedicated power days. PHAT if you want to add speed work and more training days. 5/3/1: Boring But Big if you want to shift toward strength with submaximal training.

Equipment Needed

The program as written requires a barbell, dumbbells, cable machine, leg press, leg extension, leg curl machine, calf raise machines, and a preacher curl bench.

Home gym substitutions:

• Cable Crossover / Incline Chest Fly, Cable -> Chest Fly / Incline Chest Fly with dumbbells
• Triceps Pushdown / Triceps Extension, Cable -> Skullcrusher / Triceps Extension with dumbbells
• Lat Pulldown -> Pull Up or Chin Up
• Seated Row -> Bent Over Row
• Leg Press -> Bulgarian Split Squat
• Leg Extension -> Goblet Squat or Lunge
• Lying Leg Curl / Seated Leg Curl -> Romanian Deadlift, Barbell
• Standing Calf Raise -> Standing Calf Raise, Bodyweight on a step with dumbbells
• Seated Calf Raise -> Calf Press on Leg Press or Seated Calf Raise, Dumbbell
• Preacher Curl -> Concentration Curl

Rest Times

• Primary compounds (Bench Press, Squat, Shoulder Press, Bent Over Row, Dumbbell, Romanian Deadlift, Barbell): 2 minutes between sets
• Accessories: 90 seconds between sets
• Calves and abs: 60 seconds between sets

How to Pick Starting Weights

Set your 1RM for each exercise in the app. The program uses RPE 8 to calculate working weights automatically - you don't need to pick weights manually.

If you don't know your 1RM, use the app's built-in RM calculator: do a heavy set of 3-5 reps and let it estimate your max. Or just guess conservatively - if the weights feel too light in week 1, bump up your 1RM by 5-10lb. If too heavy, drop it.

Common mistake: Setting your 1RM too high because you tested it fresh. Your working sets are done under fatigue across 3-4 sets, so a slightly conservative 1RM produces better results.

Common Modifications

• Add rear delt work: Face Pulls or Reverse Flys at the end of back day or shoulder day.
• 3-day variant: Drop the shoulder/traps day and add Shoulder Press and Lateral Raise to the chest or back day. This cuts the program to 3 days but reduces shoulder and trap volume.
• Remove intensity techniques: If recovery is an issue, you can remove the rest-pause sets (weeks 1-2) and drop sets (weeks 3-4) by editing the program — change the set schemes back to straight sets (e.g. 4x12-15 @8 instead of 3x12-15 @8, 1x12-15 @8 15s, 1x12-15 @8).