Alexis is always showing off her abs and Candle thinks she can take her down a notch with belly punching. She starts off with a warm up series of belly punches to get her red. It feels good to Alexis and this just mocks Candle for her effort. The handcuffs are not even needed because it just does not make a difference to this strong and powerful woman.
Candle gets so tired from the exertion and Alexis suggest that she use her feet and while it is humorous, it is obvious that Candle is a weakling compared to Alexis.