This challenging routine is full of intervals designed to increase your muscular and cardiovascular endurance while practicing good alignment and core safety. A weighted ball – if you have one – will really improve your grip strength as well, but you can also use a dumbbell, tin can of food, water bottle, or perhaps a docile badger? The point is: Use what works. And have fun! If you want what I’m using, this item on Amazon {click}is very close to the ball I have in the video. I’d recommend getting a 2-3 lb one. They are full of sand and easy to grip.

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