If each set is very hard and close to failure. Ideally, to stimulate muscle growth, the weight must be within a certain threshold. This is usually 85% of your one rep max. This of course would need to be tested by figuring out your one rep max and using a calculator. Of course, the other way is that 85% or above is going to limit you to 12 reps or fewer in general. So for a novice, I would start with 12, 10, and then 8 reps. The slightly higher reps would allow you to work more on the form and get your groove down. The 12 to 8 range is heavy enough to stimulate muscle, but light enough to help keep you from doing stupid novice stuff like lifting your feet off the floor, using your ribcage as a trampoline for the bar, or lifting the bar unevenly.
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