21/05/2026
When your program calls for 10RM or 75%, it isn’t a guess—it’s a precise number. In the weight room, 75% means loading about three-quarters of your one‑rep max, roughly what you can move for ten solid reps. For cardio, it usually refers to 75% of your maximum heart rate, a moderate‑to‑vigorous level—not VO₂ max, which equates to around 82–87% HRmax and feels much tougher. Why does this matter? Because your body adapts to exactly the stress you apply. Working at 70–80% 1RM for 8–12 reps builds muscle; 85–95% 1RM for 3–5 reps develops strength. In endurance, moderate intensity builds your aerobic base, while higher intensity raises your lactate threshold. Guessing “75%” and actually hitting 50% means you’re training the wrong energy system and chasing a different outcome.
Too many newcomers rely on how they feel, but perception only works if you’ve learned the Rating of Perceived Exertion scale. Otherwise it’s like driving with no speedometer and trusting the wind noise. I guide clients to use concrete targets—percentages, one‑rep max tests, reps in reserve, heart‑rate zones, or RPE (just one or two methods per client)—so we progress intelligently toward strength, hypertrophy or endurance goals. You don’t need a lab; you need to know your numbers and be intentional. Save this so you know what intensity really means next time you see it in a program.