Stationary cycling has many health benefits. It strengthens your heart, lungs and immune system. Cycling also builds strength and tones your quadriceps, hamstrings, calves and glutes. According to MayoClinic.com, a study found that when older adults exercised for at least 30 minutes, three times a week, they had a decrease in cognitive decline. Indoor cycling also increases mobility and joint flexibility in older adults. It’s also an ideal workout for those with back problems because it isn’t jarring to the spine.