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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