Zac - challenge in tight feedback loop when muscle mass is focus

The challenge in coaching muscle mass lies in the tendency to rationalize outcomes based on the level of muscle mass. There's a desire for a systematic way to measure muscle mass as it would simplify the coaching process. The speaker emphasizes the need for an emerging strategies framework for muscle mass and short-term strength to standardize coaching methods. They acknowledge the difficulty in finding a metric for gauging successful progress tied to muscle size, as short-term progress may not align with long-term best outcomes. Ultimately, the speaker suggests that drawing a line in the sand, based on a combination of experience and intuition, is key in navigating this challenge.