Ouch! Factor: 5 if you continue to heel-toe it on concrete or asphalt. (We're referring to physical pain, not the aesthetic pain some people feel while looking at minimalist shoes.)
Sprint safely: Whether you want to run barefoot on the beach or wear minimalist shoes on the sidewalk, start off walking or jogging slowly, and focus on landing on the middle of your foot, not your heel, Matthews says.
Read more: The pros and cons of barefoot-style shoes