> Of course, this type of single-snapshot-in-time study can’t tell us whether the athletes’ training actually changed their muscle health over the years or if t

> Of course, this type of single-snapshot-in-time study can’t tell us whether the athletes’ training actually changed their muscle health over the years or if the athletes were somehow blessed from birth with better muscles, allowing them to become superb masters athletes. I really appreciate this kind of honesty. It's rare that a popular article explicitly points out possible confounders.