When done properly, lifting weights is generally a safe and effective strengthening workout for several areas of the body. However, lifting weights excessively or improperly can easily result in jury.

The condition commonly described as “fluid on the elbow” is medically referred to as elbow bursitis. A small sac of fluid that sits between the tip of the elbow bone and the skin, the bursa allows the skin and bone to move freely against one another.

Your skeletal system has 206 bones that work with your muscles to allow movement. This system gives your body its shape and form. Physically active people generally have higher bone density than inactive people. Your skeletal system responds to exercise like your muscles.

Resistance exercise tones and strengthens muscles. Exercises for the shoulders are especially beneficial for developing good posture, releasing tension and increasing blood flow to the upper torso and head.

The amount of time you dedicate to lifting weights depends on your weightlifting experience and your training goals. Experienced lifters can endure more training stress and need a greater number of sessions to see continued improvement. Beginners need to allow more time for muscle recovery and to prevent overtraining.

Powerlifting and strength training are two similar activities. Both systems try to increase the strength of the person doing them. Strength training routines focus on getting a person stronger in all areas of the body. Powerlifting routines only focus on getting stronger by doing three specific exercises.

Many things contribute to muscular power, and even though muscle size is the most obvious, there are other factors that are even more important. Possibly the most critical is the central nervous system, which is responsible for the transmission of impulses to your muscles.

Whether you're hoping to improve your self-defense skills, planning to join a local boxing gym or considering a professional martial arts career, punching power is key. Your coordination, balance, timing and ability to anticipate your opponent's moves play significant roles in the quality of your punches.

It is normal to feel tired after lifting weights. Problems start to arise only when you begin to feel dizzy, nauseated or experience other unusual feelings shortly after an intense workout.

Protein is an essential nutrient that your body needs to build muscle. This nutrient is vital for the repair, maintenance and growth of muscle in addition to other body functions. Natural foods are usually the most effective way to meet your daily nutrient protein requirements.

Osteopenia -- a loss of bone mineral density that is not severe enough to be classified as osteoporosis -- can put you at risk for osteoporosis and increase your susceptibility to broken bones.

Jumping rope helps to burn calories and keeps the lower body, arms and legs in shape. It uses many of the body’s muscles, so it doesn’t take long to build lean muscle. Jumping rope burns the same amount of calories as 30 minutes of running.