The frog exercise helper belongs to a unique category of exercises that work your entire lower body. It is what is known as a compound movement; a movement that requires motion at more than one joint and involves multiple muscle groups. The frog exercise involves flexion and extension of your ankle joint, which means your calves are heavily involved. As well as your ankles, flexion and extension of your knees make the frog jump an excellent choice for strengthening your quadriceps and hamstrings. Email us: charlesklma@gmail.comVisit us: https://www.trainingmalls.com/product/frog-exercise-helper-strengthen-core-muscle/