As an 80-year-old, I can testify that three years of daily step exercises, as advised by a physio, builds leg muscles, taking pressure off the knees while aiding cardiovascular health (Embrace the climb! How stairs can super-charge your fitness in seconds, 10 October). Will youths in cars, or on electric bikes and scooters, be able to walk upstairs, let alone run, when they’re my age?
Rowan Roenisch
Leicester
One would have thought that Arnold Schwarzenegger would know his arse from his elbow, or his calf from his hamstrings. “Calves are basically the biceps of the legs,” he proclaims (Arnold Schwarzenegger’s seven big life lessons, 9 October). The biceps are
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