Hi mate
its very important to involve the feet hips and shoulders into your punches, and make sure you are fully extending the arms on your straight punches (without locking out the elbows) also dont ignore the 'feel' of your punch - go for the effortless, loose power instead of the ridgid 'pushy' feel (if that makes sense?)
if you've got an iPhone try this free app App Store - Mobile Boxing Coach
there loads of vids in it and some free workouts for you to develop your tecs on the punch bag
cheers and good luck
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