Do away with all other means of getting to work.

I sold the last car and motorcycle in 1989.

I bike to work and rent cars for weekend getaways which often involve cycling or skating at a distant location, Rail-Trail etc.

Get a full length mirror, strip down, and stand in front of it facing it. If you don't like what you see, you will be motivated (unless you just get depressed). If you like what you see, you will be motivated. For instance, about 7 months ago I quit eating all refined sugar and everything that contains it (that is humanly possible). I was never overweight to my reckoning, but I dropped 15 lbs and got ALL of my abs back. Now, when someone shows up with doughnuts or other temptations at my workplace, I go into the bathroom, fact the mirror, lift my shirt, admire my abs, and don't eat the junk. I keep a supply of whole wheat pita bread on hand in case I positively have to jam something into my mouth. Dry, cold, pita will not cause a grazing spike I assure you.

Diet and exercise. Can't make any headway unless you do both.