Treadmills are great for strengthening leg muscles, including quadriceps, hamstrings, and calves. They also engage hip flexors and glutes. They offer high versatility, allowing users to easily adjust the speed and incline, making them suitable for high - intensity interval training (HIIT). However, running or jogging on a treadmill can put more stress on bones and joints, especially at higher speeds, increasing the risk of injury over time. Ellipticals, on the other hand, are a low - impact option. They are gentle on the joints, making them a good choice for people with joint problems or those recovering from injuries. Ellipticals with arm handles provide a full - body workout, engaging muscles in the shoulders, chest, back, as well as the lower body. They also offer the option to switch direction, which can target different muscle groups. However, they may not lead to as much muscle development in the legs as treadmills, and the movement pattern on an elliptical can feel more restricted compared to the natural running or walking motion on a treadmill.
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