Celebrity trainer Louisa Drake and founder of Louisa Drake Method (LDM) loves using the LDM mini stability ball (£15) in the studio and at home. "I love the mini stability ball as it is so versatile. It can be used to aid a number of exercises, for the core and lower body in particular. It doesn't take up too much storage space at home, and it's nice and portable — you can easily pop one into your workout bag."