Stability balls are a popular tool among rehab professionals, who have long understood and appreciated the ball's therapeutic value. Fitness instructors now use balls in group fitness settings, enjoying how they challenge the core muscles while adding variety to their classes.

Ectopic heartbeats develop due to heart rate irregularities that often result in additional heartbeats or skipped beats. This variation in heartbeats generally causes an irregular pulse that can be checked by a nurse or doctor.

Your legs are powerful body parts that support movements of all kinds, including exercise like running and riding your bike. When you exert yourself more than normal, your legs may feel rubbery once you have finished your workout. Rubbery legs are common and usually do not signal a problem.

Not everyone wants to look like a gaunt fashion model. An exercise routine that includes toning doesn’t have to make you too thin.

As many as 10 to 25 percent of clinically recognized pregnancies result in miscarriage, according to the American Pregnancy Association. A miscarriage is the most common reason for a pregnancy loss.

Exercise is usually a good thing for our bodies, which thrive on movement and flexibility. However, sometimes exercise can cause problems or bring about injuries if you overdo it or have underlying health conditions you may not know about.

Exercise is possible when you have a stye, or sty. First, take some things into consideration, though. Styes are caused by Staphylococcal bacteria, which is highly contagious and can spread to other people. Depending on the severity of your symptoms, your vision may be somewhat compromised.

Mechanical efficiency is an exercise term that describes the ratio of work output to work input during physical activity. The more efficiently you move with the least amount of effort expended, the greater your mechanical efficiency.

The hydroxy iminodiacetic acid scan, or HIDA scan, is also known as a cholescintigraphy scan. This test measures the function of your liver and gallbladder with a small amount of dye or radioactive tracer.

It can be hard to breathe when your throat feels as if it’s suddenly tightening or closing during exercise. The problem is caused by vocal cord dysfunction, a condition that affects the vocal cords, or voice box, in your throat.

IPL, or intense pulse light, is a laser-based skin therapy that uses multiple wavelengths of light to treat skin conditions. Although IPL is fairly simple and noninvasive procedure, there are some effects that require a few days to recover from.

The seated cable row and the bent-over barbell row are staple exercises in any workout routine. They are both compound exercises that focus mainly on your back muscles.