Whether you're lifting big weights or prepping for a plank challenge, you need to warm up your shoulder joints. We like combining scarecrow, which lubricates the socket joint, with these straight-arm push-ups (also known as scapular push-ups). This push-up variation opens up the complicated shoulder joint and readies it for all kinds of workouts. Plus, the straight-arm push-up is great for training the upper body to work with a stabilized core.
Do two sets of eight to 10 reps.