The titanium frame also makes it durable enough to use for intense activities like running while maintaining a lightweight build. (soundguys.com)
On the other hand, interval training, alternating short bursts of intense activity with active rest, helps your body burn through calories without raising cortisol levels. (mindbodygreen.com)
Good for some customers with intense activity levels or who experience a lot of physical stress. (primalpitpaste.com)