Another cause of stiffness is joint friction. In the healthy state, joints are lubricated by a super-slippery liquid, called synovial fluid, secreted by the cartilage of the joint. As people get older and fail to consume adequate amounts of water over a lifetime, their tissues, including cartilage, lose water. Synovial fluid decreases and thickens; internal friction makes joints stiffer. I'm not going to go into a discussion of posture, here, because posture follows from muscular control and coordination, and the techniques for cultivating muscular control and coordination take more than a few words of advice; they involve specific training. According to the Mayo Clinic, a muscle strain is a stretching or tearing of muscle or tendon, a fibrous cord of tissue that connects muscles to bones. Symptoms of a muscle tear include pain at the site of the injury, swelling, muscle spasms and a limited ability to move the muscle. Normally you can treat a mild muscle strain or tear at home, but you should seek a physician's care if you are experiencing severe pain, red streaks at the site of the injury, numbness or an inability to move the muscle at all. This could signify a break. Perhaps the most common foot injury, metatarsal fracture injuries can be successfully rehabilitated with the proper physical therapy treatment plan. Depending upon the severity of the fracture, exercises focusing on range of motion (ROM) maintenance and muscle strengthening are vital for proper healing. Toe injuries can be painful to deal with. Often times, physicians and medical suppliers do not offer extensive treatments or supplies to splint a toe if necessary. Knowing how to make a toe splint will save you a trip to the doctor, and possibly some potential pain and suffering. However, if a toe injury is severe, always consult a doctor. The hip flexors are the muscles at the fronts of the hips that cover the hip joints and bring the knees forward. The visible sign of tight hip flexors is a butt that sticks out and a noticeable fold at the groin. When those muscles are too tight, they restrict the distance the leg can move back; they shorten the stride. By shortening that distance, they also prevent the natural spring in the step called "toe-off." Along with this, eating habits must also be improved. Intake of good-bacteria food, such as yogurt must increase while intake of carbohydrates must be reduced considerably. Swimming on a stability ball mimics the movements of swimming through water to strengthen the back and glutes. Learn to swim on a stability ball with tips from a professional trainer in this free exercise video. The prone knee lift with the stability ball is a leg lift with knees bent at ninety degrees. Learn the prone knee lift with tips from a professional trainer in this free exercise video. The stability ball four point bridge works glutes, hamstrings, abdominals and the lower back. Learn the four point bridge with tips from a professional trainer in this free exercise video. Sever's lesion is due to trauma. It is a common cause of heel pain in children over 10 years old, during years of excessive growth. Microtrauma to the child's growth plate, located behind the heel, causes the pain. High-speed sports provoke this condition as the Achilles tendon pulls the bone away from the growth plate. Rest and anti-inflammatory medications are recommended. Also, proper warm-up exercises, good shoes and heel inserts prevent symptoms. Overuse Injury Hammer toes result from a muscle imbalance which causes the ligaments and tendons to become tightened. This results in the joint curling downward. Arthritis can also lead to many different forefoot deformities, including hammer toes. Treatment According to the Centers for Disease Control (CDC), most people who get the varicella vaccine disease will not get chickenpox. But, if they do contract chickenpox after being vaccinated they will have a much milder case with fewer blisters and little or no fever. Children who have had a confirmed case of chickenpox may not need the vaccine if their antibodies for the virus are adequate. However, there is no harm in giving the vaccine to someone who has had chickenpox. Check with your child's doctor if you have a question concerning the need for vaccination if your child develops chickenpox.