A 56-year-old personal trainer on how to build muscle after 40 — with rucking, bodyweight, and short workouts

A 56-year-old personal trainer on how to build muscle after 40 — with rucking, bodyweight, and short workouts

Courtesy of GORUCK

Shorter workouts could be the key to getting in shape and staying that way into your 50s and beyond, according to a personal trainer who learned to work smarter instead of harder.

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