A good exercise to work out the legs. Works and gluteus and hamstrings and quadriceps.
Clubbell gives the element of instability, so involved in the active number of stabilizing muscles.
As usual - your hand is work very hard.
Run like you can on time, and on the account. At the time, I recommend mode: 60 seconds working, resting 10-15 seconds. 3 sets on each side.