Boys can grow until age 20 or later. Bones grow out from the ends, known as the growth plates, which are softer than the mature bone. This growth of the long bones in the leg, along with the lengthening of connective tissue, can cause "growing pains."

Some shoes are designed to look good, while others are designed for foot support and comfort. In addition to affecting your feet, however, footwear also affects the positioning of the rest of your leg and could potentially provoke knee pain.

According to the Mayo Clinic, your leg can swell for various reasons. For example, swelling in one leg alone may indicate an injury causing inflammation in the inflicted area. However, swelling in both legs may be the sign of a kidney or heart issue contributing to excess fluid in the body.

For years, static stretching before running was believed to have many benefits, but recent studies have shown otherwise. Pre-run dynamic stretches are actually much more beneficial.

Seemingly everyone has experienced muscle pain at some point. Many common causes of muscle pain include delayed-onset muscle soreness, a muscle cramp, compartment syndrome and the flu, according to the Mayo Clinic. A tear in the muscle body can also cause significant symptoms.

A deficiency in vitamin D may bring on symptoms like fatigue, weakness and muscle pain, aches and cramps. Symptoms may abate over time with supplements.

Lumbar strain is also known as weightlifter’s back because it is a common injury among resistance trainers. While your lumbar or lower spine is able to withstand significant pressure, sudden pushing, pulling or twisting of the spine can lead to strain that affects your back’s muscles and tendons.

The hip flexor muscles lie under your abdominal muscles. A group of muscles that includes the psoas major and minor, iliacus, sartorius and rectus femoris, the hip flexors connect your thighs to your pelvis. When they contract, these muscles bring your thigh and torso closer together.

Spina bifida occulta is a physical deformity that occurs as a baby develops in the mother's womb. The bones around the spinal cord fail to develop normally, but the nerves don't generally have any damage.

Pimples on your legs can dampen your enthusiasm for donning clothes that expose your otherwise gorgeous gams. Whether on your legs or elsewhere on your body, pimples arise from the hair follicles of the skin. In addition hair-producing cells, hair follicles contain skin oil from sebaceous glands that empty into them.

Plantar fasciitis is a relatively common condition that can cause foot and heel pain. If not treated properly, it can become chronic. After being diagnosed, it is important to take care of your body to prevent future flare-ups.

A roasted lamb shank bone, known as the zeroa (also spelled zeroah or z'roah), is placed on the seder plate at Passover. It symbolizes the two lambs that were sacrificed on the eve of the ancient Jews' exodus from Egypt. A lamb was sacrificed on the afternoon before Passover in subsequent years.