If you need to go to the pharmacy, ask how long it will take for it to be filled, and then take that time and go walk around the neighborhood instead of waiting. Not only do you get the exercise, but you can walk around a neighborhood you haven't seen much of! A fun way to spice up the walks!
Some people say not to pray for patience because it will only bring trials. I pray for patience! Let the trials come, because I know that God has his own time. Losing weight and reaching my goals will only happen when God wants it to happen, not any time sooner!
Whatever you need to do, whether it would be eating less, exercising more, getting back on track or getting motivated praying works! God is always there when you are weak. He is your support even when no one else is around, you can't get on the computer, you have no time to call a friend, etc.