Jumping rope burns calories, improves fitness, builds muscular endurance and bone strength and offers other benefits that make it a great cardio workout.

Metal Yoga Bones is a death metal yoga class out of Brooklyn that involves a lot of swearing, sweat and Slayer and basically zero zen.

Sacroiliac joint injuries are painful and can undermine any runner's training schedule. A large pair of joints located in the buttocks region on either side of the base of the spine, the SI complex includes much of the rear part of the pelvic girdle.

Stomach cramps when doing sit-ups can have a number of different causes and should be easy to avoid when you isolate the reason for them.

While they may not be the most attractive of options, running tights can help you in your running training. Keeping you warm in the winter and adding extra support, wearing tights means you can spend less time worrying about the conditions and more time focused on running.

Karate is a martial art developed for self-defense, primarily without the use of weapons. There are many different forms of karate.

Straight-leg sit-ups are an alternative to the more popular bent-knee sit-ups. Learn how to perform the straight-leg sit-up and some of its benefits.

The most recent American College of Physicians guidelines for lower back pain advocate yoga along with other more holistic approaches.

What's the most deadly fighting style? Well, much depends on who's doing the fighting but here are a few options to bring your super hero fantasies to life.

Chin-ups work your arms, shoulders, upper back and even your abs. To do a chin-up, grip the bar underhanded, keep your arms in close and pull yourself up until your chin is above the bar. A pull-up is the same exercise only using an overhand grip.

Vinyasa yoga

Humpback posture is also known as forward head posture or upper-crossed syndrome and has multiple exercises and ways of being fixed.