Pull-ups are one of the best resistance exercises you can do. Few exercises draw as much attention as someone either doing lots of pull-ups or doing some variations of the basic pull-up. They require great upper body and core strength to complete.

Pushups and chinups are body-weight exercises which have lost popularity due to the prevalence of resistance equipment that isolate individual muscles. Pushups and chinups can help you increase strength and improve muscle tone and definition, and can play a role in helping you get big or build muscle.

The pullup is a compound exercise that you can do almost anywhere -- you only need a sturdy bar to hold onto and you are good to go. However it is less simple to decide on the ideal number of pullups per session. Ultimately, how many pullups you should do depends on your own fitness goals.

Just because you're in a wheelchair doesn't mean you can't tone and build your upper-body strength.

Few exercises build more upper-body strength than a traditional pullup, in which you hang from a suspended bar and pull yourself up, using your own body weight as resistance. The simple motion strengthens the arms, shoulders, chest and back.

If you feel a spinning or dizzy sensation as if things around you are in constant motion, you may have vertigo. Causes can include problems with the inner ear or sometimes vision.

Pullups and chinups build strength in your upper body, especially the lats and biceps. They are both very difficult to start doing but they are excellent ways to train for boxing. Pullups are harder because your arm muscles can't help your back muscles as much in this position.

You're probably aware that weight lifting can result in sore muscles -- but you may be surprised to discover that your training session resulted in a sore, stiff neck and head. While it might seem odd, it's a typical response to poor form, and in most cases it's not cause for serious concern.

Scoliosis occurs when your spine takes on a side-to-side curvature rather than following a straight up-and-down alignment. Scoliosis often becomes apparent during childhood or adolescence but may also show up in adulthood.

As your skin ages and begins to lose elasticity, you might notice your jowls, or the lower cheek and jaw areas on either side of the mouth, begin to sag down. One purported treatment is facial exercises, which are supposed to tighten everything right back up.

A neck wattle, also known as a turkey neck, detracts from an otherwise youthful-looking face. If you're not ready to go under the knife to trim away extra skin and fat from a turkey neck, head and neck exercises can also restore a youthful tone to your face, according to Annelise Hagen, author of "

The femoral neck, which is located near the top of the femur bone, is especially susceptible to fractures due to osteoporosis because it is the weakest part of the femur.