in almost any exercise. Being above the ankle, movements incorporating the calf muscles such as calf raises can benefit from ankle weights. Ankle weights are useful in adding weight to pull-ups and dips, especially when incorporating leg raises into the movements. They are also useful in slow kicking katas, and static-active stretching of the legs when balancing on one leg, or suspended in the air. Light ankle weights have a history of use resistance for kicking in swimming, and of forward flexion in kicking, walking, jogging, and sprinting exercises. Concern has been expressed regarding this type of training. It may put too much stress on the joints, similar to the shearing forces found in leg extension and leg curl exercises. Practicing weighted movements at high speeds also causes the nervous system to fire at larger intensities. If an individual loses the weight without being trained to adapt to the transition, he may overexert himself without checking at the end of the movement and overextend a tendon. This is more of a risk when people fully extend their limbs in such movements and do not come to a controlled stop at the end, limiting muscle flexion. Generally, the muscle being extended is more at risk, not one held statically. For example, the quadriceps muscle could overexert in a snap kick trained with ankle weights, but in a rising kick, it is the hip flexor muscle more likely to overextend. In either case, the hamstring and associated ligaments would be at risk for a tear. One major advantage to ankle weights, unlike wrist weights, is that it adds a whole new component to exercises that wrist weights do not, since we can't grip dumbbells with our feet like we can with our hands. It is a major advantage in training rotational hip stabilizers, to work on turnout for martial arts and dance postures. To do this, the leg is bent 90 degrees at the knee, and then rotated inwards and outwards to bring the foot upwards. This is commonly seen in footbag kicks and holds. One potential disadvantage to ankle weights is they may add stress to ligaments in ankle or knee. For this reason, some expert physicians discourage running while wearing them. Footwear Weighted footwear, such as "iron" boots, sandals, and shoes, are generally very similar to ankle weights. The main difference is that being below the ankle, the calf muscle