How to Choose the Right Weight for Each Exercise depends on the goal, training experience, body structure, and execution quality. Instead of an absolute rule, choose an option that is pain-free, repeatable, and progressive.
The short answer
The right load lets you reach the planned repetition range with stable technique and range of motion while finishing with roughly one to three repetitions in reserve. The number on the weight is less important than set quality.
What matters most
Start conservatively on a new exercise. Perform a trial set and adjust from the speed and technique of the final repetitions.
If you exceed the top of the range with several easy repetitions left, the load is light. If you miss the minimum or technique breaks early, it is too heavy.
Appropriate load differs by exercise and may shift with sleep, stress, and daily fatigue. Comparing numbers with another person is not useful.
Small increases of roughly 2.5–5% on compound lifts and even smaller jumps on isolation work make progression easier to control.
How to apply it
- Set the target repetition range
- Perform a lighter trial set
- Evaluate RIR and technique
- Adjust with the smallest useful increment
Common mistakes
- Copying a program designed for a different person
- Increasing load, sets, and training days all at once
- Sacrificing range and control for a bigger number
- Changing the plan before enough data are collected
Bottom line
A good choice matches the goal and allows progress to be tracked. Keep standards consistent, collect several weeks of data, and then adjust from results.
References
- ACSM — Progression models in resistance training — https://pubmed.ncbi.nlm.nih.gov/19204579/
- Systematic review — Resistance training load and hypertrophy — https://pubmed.ncbi.nlm.nih.gov/33874848/