In your eighties, your independence often comes down to one motion: standing from a
low couch. But preserving the leg strength to do it requires far more than a daily walk.
Adults lose up to 1% of their muscle mass every year after age 30, a slow leak that
accelerates significantly after 70. Yet this decline, known as sarcopenia, is not an
irreversible biological mandate - it is largely a symptom of disuse that can be halted with
targeted resistance.
Walking is universally beneficial for cardiovascular health and joint lubrication, but it
does not generate enough muscular tension to build or maintain strength. The body only
builds muscle when it encounters resistance greater than what it is accustomed to. To
preserve the quick reaction speed to catch oneself during a stumble and the baseline
power to navigate stairs, resistance training provides the necessary stimulus.
The foundational movement for maintaining lower-body independence is the chair squat,
or sit-to-stand. This targets the quadriceps, glutes, and hamstrings - the exact muscle
groups responsible for climbing stairs and preventing falls.
Full story:
https://www.quora.com/How-do-I-keep-my-legs-strong-in-my-eighties
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