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"I wound up at a whopping 328 pounds," said Prentice.

He gained the weight after three heart attacks over five years, bypass surgery, and steroid medication.

"I felt like I couldn't do anything without assistance. I was always tired," Prentice explained.

He said that the last straw came when he discovered he could not even bend over anymore.

"One day I was sitting in the chair there and I dropped a pencil on the floor and I asked my wife to pick it up. She looked at me like ‘are you serious?’ I couldn't get it. I couldn't bend over and pick it up. I just couldn't do it and that's when I decided to change my lifestyle,” Prentice told YNN. “I quit smoking and quit the beer, quit all that stuff and just started eating healthy."

Prentice also began exercising everyday. He lost 155 pounds and has kept it off for four years now.

Jim is concerned that kids are not developing these healthy habits now-a-days.

"I've never seen a snowman in our neighborhood in several years. We've been here 30 years and I haven't seen any. I mean why can't they go out and build a snowman or a snow fort, have a snowball war, whatever. Be active!"

Jim relies on the American Heart Association for help, information, and research that will lead to more lives being saved. He also took part in Saturday's Heart Walk.