How to choose your starting weights at the gym

Separate learning the movement from selecting the load

First check the exercise instructions, adjustment points and how to finish the set. Begin with an easy practice load; with some exercises that means body weight or an unloaded implement. An empty bar or a machine with no added plates can still be too heavy, so choose another suitable starting option when needed.

Practise the movement you intend to repeat. A push-up against a higher support or a lighter dumbbell may make the pattern easier to learn. Do not use the weight chosen by a friend as your target. Your available range, experience and the equipment itself all affect the starting point.

Use the planned repetitions as a check

If the plan asks for ten repetitions, choose a load that lets you complete them with control while feeling you could still do a few more. This is a conservative first-session example rather than a requirement to predict your remaining repetitions perfectly. Stop for pain or a clear loss of control.

If the practice set is effortless, rest and try the next small available increment. If the movement becomes a swing, a shortened repetition or a struggle to get into position, reduce the load. Avoid making repeated exhausting tests simply to discover one number. A manageable first working set is enough information to begin.

Make the next decision from your own notes

Record the exact exercise, weight unit, completed repetitions and a short description such as “comfortable, a few reps left.” For dumbbells, state whether the weight is per hand. For machines, add the model and seat position. Those details help you repeat the experiment next time.

At a later session, recreate the setup and see whether the same work remains controlled. Add a small amount of load or another repetition when appropriate; you do not need to increase everything together. ACSM’s current guidance emphasises consistent participation and individualisation rather than a single complicated formula everyone must follow.

Common mistakes to avoid

• Testing a maximum before learning how to enter and finish the exercise.
• Confusing kilograms with pounds or per-hand weight with the pair total.
• Increasing the load when technique changes substantially to complete the set.