Treadmills - The Good, the Bad, and the Ugly A treadmill can be a very useful tool for improving your cardiovascular fitness. A treadmill is an excellent option for those who are worried about injury. It is safe and easy to use. Treadmills are great for intense interval training exercises. https://treadmill-workout59692.theideasblog.com/25193685/10-things-we-all-we-hate-about-treadmill