The muscles most commonly worked when using a pedal exerciser are the quadriceps, hamstrings, and glutes. However, depending on the type of pedal exerciser and the user's fitness goals, other muscles may be targeted as well. For example, some pedal exercisers have handles that allow users to work their arms while they pedals, which can tone the biceps and triceps. Additionally, many pedal exercisers are low-impact, making them ideal for seniors or people with joint pain. This means that users can get a great workout without putting too much strain on their bodies.