Complete core workoutdual resistancecompact design wonder core smart fitness equipment - get a well-rounded workout every time whether you are prepping for a sport or just toning up to fit into that new swimwear, the wonder core 21.6" core fitness equipment can help fast-track your fitness journey. now you can tone your muscles and get that much needed cardio workout in one equipment. the wonder core 21.6" core fitness equipment is an ideal partner to fully work your core and upper body you can now workout your upper, middle and lower abs and obliques, thighs, gluts, calves, forearms, triceps and biceps with ease this fully assembled set is compact and portable dimensions: 20.5”l x 21.6”w x 15”h