This Summer's Workout Threat-o-Meter

Hiking

Surprise risk: You may be a sure-footed mountain goat who rarely worries about newbie mistakes like stubbing your toes or slipping on inclines. But boldness can lead to other problems. Over time, taking large, fast steps up ascending rock faces can strain your calves and Achilles tendons, says Mandy Pohja, a wilderness instructor with the National Outdoor Leadership School.
Ouch! Factor: 3 to 4. Rest is the best treatment for these types of lower-leg strains, which means you could be off the trails for the rest of the summer. (Bummer factor: 5+)
Climb safely: Taking smaller strides on rocky patches will help keep your hips over your feet, Pohja says.

Read more: Hiking mistakes to avoid