For my birthday, my lovely, clever husband made me two boxes. They are very versatile as they can be put at 20 inches, 24 inches and 30 inches.
So far my clients have all managed the 20 inch side.
Try this little workout to get you warmed up, hot, sweaty and out of breath!
1 minute of box jumps
1 minute of skipping
1 minute of press ups
1 minute of chin ups