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Guides

Muscle mass after 40: why it matters and how to track it

From midlife, muscle deserves attention. Tracking it is simple when the same measurement is repeated on a schedule.

Short answer

Muscle mass tends to decline gradually with age unless it is trained, and that matters for strength, balance and daily function. Tracking muscle mass by segment, with a scan every 12 weeks under similar conditions, shows whether training and nutrition are working. Reports are for reference, not a medical diagnosis.

Last updated: November 2026

Why muscle matters

Muscle supports strength, balance and everyday movement. Many people lose some of it gradually with age, and the loss is easy to miss when body weight stays the same.

What to track

  • Total muscle mass
  • Muscle mass by segment: arms, legs and trunk
  • Body fat and visceral fat level
  • Waist-to-hip ratio and circumferences
  • Posture, plus shoulder and neck mobility
Free-weights area with dumbbells and benches in a wood-clad gym

Why segments help

Reading arms, legs and trunk separately shows where muscle is changing and whether one area lags. That gives a coach something concrete to act on.

A simple 12-week rhythm

Take a baseline scan, train and eat to a plan, then re-scan after 12 weeks at a similar time of day and hydration. Compare the reports, adjust the plan and repeat.

Visbody M60 sample report
Visbody M60 3D body scanner

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