Jumping on a mountain bike?

I have a not so great mountain bike with not very good suspension and the route I take home with my friends involves a lot of curbs and jumps. I really can't jump my bike to save my life as the frame is so damn heavy I was wondering how I could improve my pumping ability on my bike as I was on my friend's bike... show more I have a not so great mountain bike with not very good suspension and the route I take home with my friends involves a lot of curbs and jumps. I really can't jump my bike to save my life as the frame is so damn heavy

I was wondering how I could improve my pumping ability on my bike as I was on my friend's bike today and he has a brilliant bike and getting up curbs was so effortless. So how can I learn to do jumps on a heavy bike?
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