Hope this helps:
*Plantar fascitis (arch pain). Arch pain is caused by stressing the bottom part of the foot. The plantar fascia is a fibrous band running from the front to the back of the bottom of the foot.
*Shin Splints. Shin splints are probably the most common lower extremity injury. Pain is usually felt along the shin muscles (front, middle or back) and is a result of high impact forces or training on improper surfaces.
*Achilles tendinitis. During aerobics we spend a lot of time on our toes. This creates pain and tightness in the back of the calf. Stretching the calf before and after class is helpful. Also, remember to bring your heels down. You should not always be up on the balls of your feet.
*Stress Fractures. Stress fractures, like shin splints, are caused by improper footwear, hard surfaces and overuse syndromes.