Question

How often do you need to evaluate your exercise progress and make changes to your exercise regimen?

Answer 1

I would say every 6 weeks or so for evaluating your progress, as for changing it around. Do that only as needed, if you feel like you have plateaued then switch it up.

Answer 2

I'd say it's whenever your body is used to the workout. When the workout becomes easy to do, change it.

Answer 3

That's what plateauing means. Whenever you stop making your muscles sore from that particular workout.