Final answer:
If a client can perform two or more reps in the last set for two consecutive workouts, the weight should be increased by a modest amount, commonly either 2.5 or 5 lbs, to continue challenging the client and to promote progression.
Step-by-step explanation:
When a client can perform two or more reps in the last set of their workout for two consecutive sessions, it's generally recommended to increase the weight to ensure continued progress and adaptation. This concept is rooted in progressive overload, the principle that to improve strength and fitness, one must continually increase the demands on the musculoskeletal system.
The appropriate amount of weight to add depends on various factors, including the client's fitness level, the exercise being performed, and the weight they are currently lifting. In many resistance training programs, a modest increment is advisable to both prevent injury and ensure the client is able to manage the new weight with proper form. A typical increase might be 5 lbs (option a) or 2.5 lbs (option b). However, if the previous lifts were performed with a high level of ease or the client is lifting heavier weights, it may be appropriate to consider a larger increment such as 10 lbs (option c).
Based on the information provided, and assuming typical resistance training guidelines, if a client is progressing well and managing two or more reps in the last set for two consecutive workouts, it would be safe and effective to consider increasing the weight by a minimum of 2.5 lbs (option b) to a moderate increment of 5 lbs (option a).