If you're serious about running, hills are an amazing way to build endurance and improve strength. Get familiar with hill repeats in this video from The Run Experience.

We asked 30 trainers and nutritionists to share which items they keep in their homes to help them accomplish their goals (and to motivate you to surpass yours).

Ever wondered what personal trainers put in their gym bags? Discover 30 must-have fitness tools the pros can't live without.