Here's my 2 cents free:

Try riding in the morning not eating anything for how long you wish. That would help burn fats off. However, maybe you still have to do exercises to target the area where you wanna burn off fats.

The logic of not eating before you ride is to get your body to burn fat instead of carbohydrates you have stored in your body. Then by doing the exercises that target specific areas, it might further help burn the fats there.

Still, you have to be persistent and not give up hope. There cannot be results overnight, but soon, you'll notice marked improvements. REMEMBER : Stretch before and after your exercise, think that helps to get the burnt fats away from the areas.