Twist trainers are effective tools for developing core strength and muscle endurance. They primarily target the obliques (sides of your abdomen), abdominals (belly muscles), and lower back muscles while also engaging muscles in your hips to some extent.

The chin-up is efficient for cultivating upper body vigour and muscular stamina. It primarily focuses on the latissimus dorsi (large muscles at the back) and biceps (forearms) while also involving muscles in your back, shoulders, and forearms.