Store › Core FX Ankle Cuff Core FX Ankle Cuff $18.99 The Ankle Cuff is to be used with a weight stack cable machine, helping strengthen and tone your lower body.Tone & StrengthenTarget your calves, lower legs, glutes and lower body to tone, strengthen and tighten key muscle groups.Comfort Meets FunctionThe ankle cuff is comfortable, breathable, and fully adjustable for a secure fit. Add To Cart Added! The Ankle Cuff is to be used with a weight stack cable machine, helping strengthen and tone your lower body.Tone & StrengthenTarget your calves, lower legs, glutes and lower body to tone, strengthen and tighten key muscle groups.Comfort Meets FunctionThe ankle cuff is comfortable, breathable, and fully adjustable for a secure fit.