Heart, lungs, cardiovascular benefits — for sure.
After 17 days on the John Muir Trail I felt fantastic. Lean and fit.
But there are some risks with long slow distance exercise over many, many days.
- Perhaps 5000 calories burn rate fuelled by junk food, in many cases
- reproductive system may be affected
- possible bone density loss — but it should be restored after a few months
Of course there’s a risk of injury. Especially chronic injury.
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