For example, if you see "4 x 6," you'll know that it means 4 sets of 6 reps since 6 is the second number, and reps are always second. Likewise, if you write "145 x 6 x 4" for your squat workout, you're indicating that you squatted 145 for 4 sets of 6 reps since - again - 6 is the second number, and . . . reps are always second. In this case, you call on your grade school skills and use context clues to determine that 145 lbs must be the weight and 4 must be the number of sets . . . since squatting 4 lbs for 145 sets is just plain ridiculous.