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Program designer

Write your own strength program, simulate it, and see where it takes you.

Describe a program in IronScript, simulate it session by session, and project it out months before you run a single rep.

Open the designerTry a proven program instead

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Your programs

New program

Start from proven

Fork a program that already works

Open an editable copy of anything IronGains ships, then change what doesn't fit you. The original stays untouched.

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5/3/1 – Boring But Big 5/3/1 for Beginners Greyskull LP GZCLP 3-Day GZCLP 4-Day r/Fitness Basic Beginner Routine

Write it in IronScript

A small language for training programs: schedules, working weights, and the progression rules that move them.

Step through every session

Walk the program forward set by set, hit or miss the reps, and watch the progression branch the way it would in the gym.

See where it lands

Project each lift out 8 to 24 weeks from your own starting numbers, before you commit a single session to it.

Ready to actually run it?

A free account syncs your programs off this browser, unlocks the AI Builder, and lets you enroll and log sessions on your phone.

Create a free account