Source: How to Push Past a Fitness Plateau: Get Unstable
Once you've mastered the basic moves of strength training - like squats, lunges, and planks - gym time can become a little dull. Workouts creep by slowly due to boredom, and if you don't push yourself to the next level, you may find your fitness level stalling as you coast onto a plateau. When the going gets boring, it's time to get unstable. Performing seemingly simple exercises on an unstable surface creates a whole new set of challenges for you to master. Fitness tools like the BOSU, balance pads (sponge-like pads, two to three inches thick), rocker boards, and exercise balls can help you work out harder by disrupting your sense of balance. If you're ready to experiment with instability, here are a few exercises my Equinox trainer has recently taught me.
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Plank on the rocker board: There are a wide variety of rocker boards, but for this move the one we use looks like an over-sized skateboard with a cylindrical piece