When it comes to punching power we tend to lose power in our joints. You can see our bones as pieces of a kinetic chain linked together by tendons/joints which makes up how our body transmits force. Proper technique/body-alignment is important but a lot of force is still lost at the point of contact. It's simply impossible for a man with weak wrists/forearms to punch hard no matter how well executed their technique may be.
Understand?
Now if your wrists or elbows bend and gives in at the point of impact then you're losing a lot of force in your punches. You can understand this point when your wrist is bent when throwing a left hook, or if it bends accidentally when thowing a hard straight. And on all punches the shock of the impact goes right to your forearm/elbows. If you are weak in any of these areas then not only will you lose power, you'll be more prone to injuries.
Now here's the simple solution...
Assuming that your technique is ok, and that you've made the proper adjustment in your stance/body-alignment you can work on strengthening your weak links.
If your weaker link is your wrists (as it is with a lot of people) you should start working on that sticking point. Generally curling or rolling your wrist with a weight will help strengthen the surrounding muscles, and the joints/tendons to a lesser extent. One way I like to do it is a wrist roller which I have posted below:
Wrist Roller
This one is a forearm killer that makes your wrists stronger. This is easy to make and is never combersome, all you need is about a 3.5 ft cord tied or inserted through a pipe or a broom handle or the like, which the other end is attached to a weight which can be improvised.
Here's how you do the the exercise. Start with your arms extended infront of you holding the pipe evenly on both near the ends just like you would grip a bike's handle bars.
While keeping your arms extended the whole time, start by slowly rolling it all the way up, and then all the way down. For a good workout try 3 trips up and 3 trips down. As for some tips make sure you work on getting the full range of motion, and don't try to go too fast. Set a weight that is challenging but not too heavy or light.
The goal isn't to build up massive forearms, just don't get caught up in trying to do more and more weight, work on increasing strength and up repetions.
There's other exercises you can do, I've mentioned wrist curling weights, and another thing helps your wrist is building up your hand's grip strength. You can do this with hard labor, or there's a few exercises with or without equipment. I'll go over a few pieces of equipment that I use to work on grip...
Bruce Lee's Grip Machine
This is the best piece of equipment that I have used when it comes to building grip strength. As you can see it is plateloaded so therefore I can treat it like any other piece of equipment (e.g. sets/reps). This isn't work the forearm as the wrist roller that I had gone over, but it's the best way to improve your grip strength that I know of. It can be downright brutal, if you want to get an idea what this is feels like then try bending a strong piece of metal. It's mind over matter.
Last but not least is a regular hand gripper like the kind you'd see in most sporting good stores. Here's mine with a slight adjustment:
Chris's Hand Gripper
I've put a garden-hose tie around the spring which keeps it from from flexing outwards. This gives it much more resistance.
What I love about it is how small and convenient it is, I can use it while I'm driving, or w/e. With this piece I generally try to get as much reps in as possible, working to squeeze it as hard as I can each time.
Anyways there's other ways to improve your grip strength, but I prefer these devices because how effective they are at strengthening my grip and forearms which means I'll be able to deliver a lot more power in my punches.
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