This is the Pro Riser: a portable exercise machine that you can use anywhere to work your body hard. You can use them to do push ups, dips, mountain climbers, and a lot more. It is available in two different weights (4 & 8 lbs). Its 90-degree inside handle lets you hook these over any stair.
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Pro Riser supports over 400lbs of weight. It has non-slip grips for safe workouts. You can find out more about it here.
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