If I were to flip you the bird left-handed, which I sometimes do to mix things up, you’d notice that my middle finger is crooked, with a bulged knuckle. Why does it look like that? Catfish noodling.

Sample Workout: 40-minute run/walk, alternating between a comfortable jogging pace for 3 minutes and a walking pace for 2 minutes. Recommended Experience: None! This plan will get you running strong ...