Burpee Alternatives For Beginners
Burpees For People That Can't Do (or Don't Like!) Burpees, Straight From 2 Trainers
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Stephen and Jonathan both told us that incorporating an elevated surface like a box or a bench reduces the distance between you and the floor and makes the burpee easier. There's less range of motion here and also less impact on your joints.
Note: this video shows a modified version without push-ups.