Every workout is written with an intent — a stimulus. A short sprint is meant to be a sprint. A heavy day is meant to feel heavy. A grinder is meant to make you uncomfortable for fifteen minutes straight. Good scaling protects that intent. Bad scaling quietly throws it away.
The most common mistake isn't scaling too much — it's scaling in a way that changes the type of workout. Take a punchy five-minute sprint, load it too heavy, and you've turned it into a twelve-minute strength grind. You finished it, but you didn't do the workout that was written. Here's how to scale without losing the plot. Browse the full workout library and every session lists its intended stimulus.
Find the intent before you touch the numbers
Ask what the workout is for. Is it a fast, light engine-builder where you should barely stop moving? A heavy day where the weight is the whole point? A long grind that's testing whether you can keep going? The answer tells you what you're allowed to change and what you have to protect.
If the intent is "fast and unbroken," the load is negotiable but the speed isn't. If the intent is "heavy," the reps are negotiable but the weight isn't. Name the intent first, then scale everything else in service of it.
Protect the time domain
The clearest signal you've scaled well is the finish time. If a workout is designed to take elite athletes seven minutes, and it takes you twenty-five, you didn't scale — you did a different workout. The stimulus of a seven-minute effort simply does not exist inside a twenty-five-minute one.
Pick loads and rep counts that land you in roughly the same time window as the workout intends. A good rule: a "sprint" should still be a sprint for you. If you can't keep moving, the weight is too heavy or the volume is too high — cut it until the clock matches.
Substitute movements by their job, not their name
Can't do the prescribed movement? Replace it with something that does the same job. A muscle-up isn't really "a muscle-up" in the workout — it's a high-skill pulling stimulus that gates your pace. Swap it for something that pulls hard and gates pace similarly, not for ten easy ring rows that you fly through.
Match the muscle group, the energy cost, and the difficulty. A good substitution keeps the workout feeling like the workout. A lazy one — picking whatever's easiest — turns a gymnastics test into a cardio jog and quietly deletes the part you most needed to train.
Log it as scaled — and be honest
Scaling is not a smaller achievement. The athlete who scales intelligently and hits the stimulus got more out of the session than the one who went prescribed, blew up, and turned a sprint into a slog. There's no shame in the modification — only in pretending it didn't happen.
Record what you actually did: the load, the substitution, the result. That history is what makes your next attempt smarter — and it's why a scaled score and a prescribed score sit on separate leaderboards in Fiz. Compare like with like, watch the gap to prescribed shrink, and scale up the day you're ready.
Name the intent, protect the clock, substitute by job, and log it honestly. Scale like that and every workout does exactly what it was written to do — whatever weight is on the bar.