Kicking air full power really hurts the knees in a long run. When you are young, you can get away with it, but watch out when you get older. This is a long game, not a few years deal.
Besides, you don't get power from kicking air, you gain speed only. Hitting a heavy bag is a totally different deal. That's where you get the power. Too much heavy bag will make you slow, so you really need both.
I don't like water based stuffs like Slam Man or others. It's too light to fill with water, I can knock it over just by punching. I never try to fill with sand, but then I have to worry about breaking the whole thing if the base doesn't give. I had both Slam Man and another one advertised by Chuck Norris at the time, I gave them away. I have one 100lbs long one and a 70lbs shorter one hanging. I hit one after the other to give me a better workout. I do half air and half heavy bags.
Besides, you don't get power from kicking air, you gain speed only. Hitting a heavy bag is a totally different deal. That's where you get the power. Too much heavy bag will make you slow, so you really need both.
I don't like water based stuffs like Slam Man or others. It's too light to fill with water, I can knock it over just by punching. I never try to fill with sand, but then I have to worry about breaking the whole thing if the base doesn't give. I had both Slam Man and another one advertised by Chuck Norris at the time, I gave them away. I have one 100lbs long one and a 70lbs shorter one hanging. I hit one after the other to give me a better workout. I do half air and half heavy bags.
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