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Can some please explain what the "1 RM" means in "...40% of 1RM"?


New member
"RM" means "rep maximum." A 1RM is the largest amount of weight that you can lift for one rep. A 5RM is the most weight you can lift five times, etc.

Steve B.

New member
40% of what you can lift 1 x is.
Example if your max for a lift is 1 x 100 pounds then 40 pounds would be your 40% of your 1RM.
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