You are hereHome / Training / Build Muscle The Buddy Workout Routine Exercise 5 Mountain Climber Time: 30 Seconds While in pushup position, explosively bring one knee up to your chest. Then drive it straight back while you bring the other up. Do as many reps as you can in 30 seconds. Then it’s your buddy’s turn. PagesPREV12345…NEXT Want more Men's Fitness? Sign Up for our newsletters now.