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The following Mark's Daily Apple article was written by Mark Sisson and is narrated by

Brock Armstrong.

A brilliant way to enjoy the summer.

We're springing into summer and into perfect weather for outdoor activities.

We're already there in Malibu.

I've been catching some rays and vitamin D as a result while hiking, paddleboarding, cycling,

and playing Ultimate Frisbee.

The key word in that last sentence is playing.

It's central to how I stay in shape and enjoy life.

But it wasn't always this way.

As many of you probably know, my love of low-level aerobic activity and sport, as play, developed from a 20-year

career as a competitive endurance athlete. I logged tens of thousands of training miles, pounding the pavement

and hammering the bike, developing all sorts of physical ailments in the process. At the age of 28, I was diagnosed with debilitating osteoarthritis,

and eventually succumbed to chronic hip tendonitis

and nagging recurrent upper respiratory infections.

...