Since it is hard to know what your child's strengths and weaknesses are, we have to guess. Is he/she overweight? Weight is a factor in mobility. Does he eat well-vegetables, meat, fruit, milk products, carbos, vitaminsĀnutrition is a factor for energy and strength-building.
As for speed and power, they come from practice if the before mentioned factors are met. We do drills - like running around objects like cones, jumping from corner to corner (mats), over barriers, sparring drills-slide jumping front, side, combinations -like hop side, spin side to get quicker.
You can also cross train. My son's skateboarding activities, led to some awesome jumping ability. Skateboarding ie broken arm can be counterproductive to TKD, though.
How often does your son/daughter practice? 2 - 3 times/wk is pretty minimal and gain is seen more slowly. 5 times a week would bring much more visible and faster gain in strength and speed from my experience.
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