Everybody wants to grow fit. But when this liking for fitness and gymming starts becoming an obsession and you give rest days a miss, you are doing massive damage to your body. Excessive exercising is bad for your health. Now, a recent study reveals that excessive cycling without adequate rest can out your sperm health in trouble. Cycling has tons of health benefits like improving your cardiovascular health, busting stress, promoting weight loss, toning legs and others. But a Clinical Journal of Sports Medicine study says cycling for long hours without rest or adequate rest can be bad for your sperm health.