When you can’t get to the gym, don’t want to invest in tons of at-home workout gear, and don’t like weights, but still want to get in a serious work out, consider balancing discs. The Xerdisc, which retails for around $20, enhances your work out by forcing more muscle groups to engage while you squat, lunge, or push up. You can even sit on this disc while at work and all day you will b…

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