The first set shouldn't kill you, but completing all sets should be a real challenge.
e.g 3 sets of 15. if you used 15rm, you may get 15 for the 1st set, but after the (short) rest, you prolly can't get more than 10. If you got 15,10,8, you got 33 total reps, and you need 45. You need to lower the weight if you're gonna get 45.
if you lowered the weight and got 15, 14, 13, you need only 3 more reps. you can keep working with the same weight until you get 45. (then add weight)
I usually have no idea what's the right weight when it's more than 5 reps/set. So if a program has more than a few exercises with high reps, I usually add one day (W0). The only objective on W0 is to figure out the right load for W1. (I tried using a %RM calculator, but it just didn't work)
suppose I have to do 3x15 for cable-row. I might end up with 6-7 sets on W0 if I struggle to get it right (if the weight feels too light, heavy, then I'll abort about half way through). but by the end of the day, I have a pretty good idea on what will be a challenging weight for 45 reps (total)
I don't know if it's the right thing to do. but before i started doing this, i usually started out too low for some, and too high for others.
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