Find your 1RM =
1) Multiple the number of repetitions you can perform on an exercise to failure by 2.5, for example, a load you can lift 10 around
2) Subtract that number from 100 to determine the percentage of your 1RM
3) Divide the above number by 100 to get a decimal value
4) Divide the weight you lifted by the decimal value to get your estimated 1RM
(Weight x Reps x 0.0333) + Weight
Example 1: 250lb squat for 10 reps
(250 x 10 x 0.0333) + 250 = 333 1RM
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