Waiter walks can be done unilaterally or bilaterally. While you can't go as heavy with waiter walks as you can with traditional farmers walks, they're great for increasing shoulder stability and strength because of the additional scapular activation. They're also great for the core or just for a challenging metcon workout.
Waiter Walks: One Handed
Waiter Walks: Two Handed
Execution Tips
Maintain a tall spine by keeping the head in a neutral position with the eyes forward, while pulling the shoulders back and down.
Make sure your grip is centered on the handle.
Squeeze the glutes, brace the abs, and keep your chest up.
The right kind of lifting will increase mobility and flexibility better than stretching or goofy mobility drills. And you'll build muscle too. Check this out.
There are 3 ways to simulate growth: Inflict structural damage, increase neural activation, or prevent blood and oxygen from entering the muscle during a set. Few exercises do all three, but the constant tension alternate curl does.