These are MRI cross-sections of leg muscles of an active 74-year-old vs. a sedentary 74-year-old. Wow! The active 74-year-old’s image is almost identical to the 40-year-old triathlete’s lean muscle mass! Well, if this doesn’t make you want to get to the gym, I don’t know what would.

You can read more about this study in the journal Physician and Sports Medicine.

Via Jay Parkinson and World’s Best Ever