Power / Strength
Strength is one of the easiest things to improve through systematic excercise using isometrics, callisthenics or weight training.  The difficult  thing is to ensure that flexibility or skill do not suffer as a result of an imprudent strength-training programme.
Weight training is sometimes considered to be a panacea as far as sorting out people's weaknesses goes and indeed good results can be obtained through sensible and systematic use.

However, it is a mistake to think that weight training is the only way to increase strength.  Traditional callisthenics can be extremely effective - look at the power and physique of world heavyweight boxing champion Mike Tyson, who never trains with weights!  Excersice physiology is still a very inexact science as a result of the huge variation in somatype and muscle-fibre distribution in human beings, so it is important to discover the excercises and training programmes which work for you.

- V-UPs. Lay flat on your back and lift your legs and upper body at the same time,
   forming a 'v' .  Try to touch your toes.

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Side Sit Ups. Lay on your side and lift your upper body, trying to bring your                  shoulders towards your hip.  Work both sides.

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Calf Raises. If you don't have access to weight machines then place the balls of your
   feet on a slightly elevated edge and lift up on your toes.

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Jumps. 3 Variations: 1) Jump as high as you can, tucking your feet to your butt. 
  2) Jump up tucking your knees to your chest.  3) Jump up and split your legs outward
  and try to touch your toes while in the air.

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Kick Backs. Gdown on all fours.  Look over your shoulder at a focal point high on
  the wall.  Try to kick that spot slowly your first set.  Don't let your knee touch the
  ground between kicks.  Repeat this excercise fast for the second set and slow for the
  third set.

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Push Ups. Yep I bet you thought you were going to get away with/out doing the good
  old push up!  Develop your upper body for punching and blocking

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Squat Kicks. Crouch down deep.  Quickly leap in the air and perform a flying front
  kick.  Land back into a crouch.  Work both legs.
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