Question 1

What is 1RM?

Accepted Answer

1RM (One Rep Max) is the maximum weight you can lift for one repetition with proper form.

Question 2

Which 1RM formula is best?

Accepted Answer

Epley works well for 5-10 reps, Brzycki for 1-5 reps. The average of all three is usually most reliable.

Question 3

Why calculate percentages?

Accepted Answer

Training programs set weights as a % of 1RM. For example, 5×5 uses about 80-85% 1RM.