ride your bike everyday, bike to work/school/everywhere, eat healthy, remember that every little thing you eat adds up so make it count, don't drink pop or sugary beverages (including some juices). awhile ago i dropped 30-40 pounds and i'm in the best shape of my life, i bike 13 miles to practice for my cross country team where we put in 5-6 miles a day- in other words, i basically do 2/3 of a triathalon daily. So do something like that if you can.