How do you determine exercise intensity for a client who cannot complete a full 1RM?

How do you determine exercise intensity for a client who cannot complete a full 1RM?

• A. Use a fixed, light load regardless of client
• B. Test a true 1RM with maximum effort
• C. Use submaximal testing to estimate 1RM or use RPE/percentage of estimated 1RM
• D. Only use heart rate zone without considering effort

Answer: (C)

When a client can’t perform a true 1RM, you dose intensity by estimating the max from submaximal effort and by tracking effort with a rating scale. Have them lift a weight they can control for a known number of reps (a challenging set of 3–8 reps, for example). Use a validated formula to estimate the 1RM from the weight and reps completed, or use the reps-at-a-weight approach to guide future loads as a percentage of the estimated max. Pair this with a perceived exertion rating to confirm the effort matches your target; if the RPE is too high or too low, adjust the load. This method safely reflects current strength, provides a practical way to prescribe resistance training, and adapts as the client progresses. Heart rate alone isn’t sufficient for setting resistance, because it doesn’t directly measure muscular load or fatigue.

When a client can’t perform a true 1RM, you dose intensity by estimating the max from submaximal effort and by tracking effort with a rating scale. Have them lift a weight they can control for a known number of reps (a challenging set of 3–8 reps, for example). Use a validated formula to estimate the 1RM from the weight and reps completed, or use the reps-at-a-weight approach to guide future loads as a percentage of the estimated max. Pair this with a perceived exertion rating to confirm the effort matches your target; if the RPE is too high or too low, adjust the load. This method safely reflects current strength, provides a practical way to prescribe resistance training, and adapts as the client progresses. Heart rate alone isn’t sufficient for setting resistance, because it doesn’t directly measure muscular load or fatigue.