I test 1RM before and after a new workout program. I tend to rotate programs every 3 months. For example, I'm currently doing a Upper/Lower split right now, with a heavy and light day for each. I'll run it for 12 weeks. I'll 1RM test my Bench/Deadlift/Belt Squat/OHP and One Arm Row before I start it, then again after 12 weeks. That being said, I'm a numbers and graph geek, so it's motivating for me.
One other thing. I think the 1RM calculators are pretty good up to 3-4 reps. Beyond that they become increasingly inaccurate, and eventually absurd.
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