This video has 10 diffrent exercises you can do using a step. I recommend making a circut out of several of these exercises and going for 30-40 seconds and resting for 10 seconds.
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Music Cephelopod - Cephelopod by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1200081
Artist: http://incompetech.com/