If you want strong and toned arms, shoulders and upper back, this yoga exercise, which is used as preparation for headstand, is your best friend. Start with just few repetitions and really focus on doing it correctly (moving from your shoulders/chest, not hips), take a rest and repeat. You’ll be amazed how quickly you get stronger and can do more reps.
Make sure you don’t move your bum up and down, all the work is done with your arms/upper body, to do this you need to keep your tummy in tight.
Finish in child’s pose with your arms stretched in front of you.