Cardiovascular
A good cardiovascular workout (aerobics) is probably one of the most important, if not the most important, thing you can incorporate into your training. It's great for over-all endurance and are great confidence builders. There is a very long list of reason why you should use these, but it would be a waste of time to put them here. Basically, if you do nothing else, then use these. If you lift weights, or do any other kind of muscle strengthening, do these exercises every other day, opposite of lifting weights.
Jogging
Jogging is probably the simplest form of aerobics and can be done virtually anywhere, anytime. If you have a treadmill collecting dust somewhere in your house, then get it out! They are very convenient since you can jog anytime you want. There is so special way to jog, except to make sure that you do it at a regular rate. If you go a long time without jogging, you'll find it harder to get back into the process. There are a few ways you can run. Those being on the ball of your foot (which strengthens your calf muscles quite well, but is much more tiring), from your heel to toe (probably the most used method), and flat foot (almost like heel to toe, but your whole foot hits the ground at the same time). Make sure you stand up straight and makes sure you take deep breaths.
Jumping Jacks
Yes, that's right, Jumping Jacks! Doing a hundred of these babies will not only work your leg muscles but will also improve your endurance quite well. Of course, if you haven't done any in a long time, you may find a hundred to be a little challenging to say the least. Work your way up. Do 25 at first if necessary. With practice, then try 50, then 75, then 100. Keep going! If you honestly have no idea what a jumping jack is, here's how you do it: start with your legs together, and your hands at your sides. Next, hop, and spread your legs, while raising your hands above your head. Hop again, and return to your original position. That's one! Of course, you should do these a lot faster than I can explain them (approximately one per second).
Good "luck"!
...Jedi Streen
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