Most people start to lose small amounts of muscle in their thirties, but the decline speeds up after forty. This loss of muscle and strength is called sarcopenia, and it makes everyday tasks harder while raising the risk of falls and chronic illness.
Walking or other gentle cardio keeps the heart healthy, yet studies show it does little to stop sarcopenia. The only activity proven to rebuild or keep muscle is resistance training, workouts where muscles push or pull against a load such as dumb-bells, elastic bands, or body-weight moves. Two or three short sessions each week can even reverse early muscle loss.
Research also finds that strength work is more effective when paired with enough protein. A 2025 review of 38 clinical trials reported the biggest gains in muscle size, strength, and walking speed when older adults combined resistance exercise with about one gram of protein for every kilo of body weight each day.
Good beginner moves include squats, rows, lunges, and push-ups. Start with light loads, focus on slow, controlled form, rest a day between sessions, and add weight gradually. On non-lifting days, brisk walking, cycling, or swimming support heart health and aid recovery.
By adding regular strength work to normal movement and eating enough protein, adults over forty can stay stronger, move more easily, and lower many age-related health risks.
Haiping Tian et al., “Comparison of the Effectiveness of Protein Supplementation Combined with Resistance Training on Body Composition and Physical Function in Healthy Elderly Adults.” Journal of Nutrition, March 2025.
Systematic review of 38 trials shows that pairing resistance training with protein intake improves muscle mass, strength, and mobility more than either approach alone.
Shereen J. Lehman, “2 Habits Women Should Do for Healthier Aging, According to a New Study.” EatingWell, July 24 2025.
Highlights the Nutrients study confirming that twice-weekly strength training plus adequate protein is the most effective strategy to stay strong after mid-life.
UT Southwestern Medical Center, “Strength training over 60 can help prevent sarcopenia.” MedBlog, January 6 2023.
Explains how resistance exercise slows age-related muscle loss and offers practical tips for safe workouts in older adults.
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