get a gym membership?
bike with a sweatshirt on. run with a sweatshirt on. Eliminate soda, dont eat chips/snacks, buy fruit, cut down red meat, start eating salads with little to no dressing, eat smaller portions more frequently, stop eating 3 times with larger portions, drink plenty of water, do situps 2 times a day, do pushups 2 times a day (2 sets for each each time).
oh and when you start exercising, make it a religion. Do it atleast every other day. Find time to do it, put off watching tv to do it. Put off smoking weed to do it, hell, smoke weed after lol. Its just an hour (at most) out of your day, thats not too much to ask at all. (im not pickin on you, just stating)