Free tool
Lower-fatigue exercise swapper
Swap a heavy compound lift for one that trains the same muscles while taking less out of you.
Short answer: To train the same muscles with less overall fatigue, swap to a supported or machine version: a hack squat or leg press for back squats, a hip thrust or Romanian deadlift for deadlifts, and a chest-supported row for bent-over rows.
Trains: Quads and glutes
1. Hack squat
The pads take the load and the sled guides the path.
- Less load on the spine
- More stable, so less balancing
2. Leg press
Your back is supported, so the legs do the work.
- Less load on the spine
- More stable, so less balancing
3. Bulgarian split squat
One leg at a time needs much less weight on your back.
- Less total weight moved
- Less load on the spine
Reasons come from how each exercise is set up, not measured fatigue scores. Swap to manage tiredness or equipment, never to train through pain. If a movement hurts, stop it.
Why swap a heavy lift
Big free-weight lifts load your spine and need balance, as well as working the target muscles. Supported and machine versions keep the target muscles working while asking less of everything else.
Do machines build as much muscle?
A systematic review found no meaningful difference in muscle growth between free weights and machines, although the evidence is from small trials (Haugen et al., 2023).
What this tool does not measure
Fatigue has not been measured for each pair. Reasons come from how each exercise is set up. No validated stimulus-to-fatigue score exists, so none is given.
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Educational information for adults aged 18 and over. It does not diagnose, treat or manage any medical condition. If you have a health condition, or symptoms that worry you, speak to your doctor or a health professional.