Mixing a cardio exercise (ex. running, spin bike etc) with a resistance exercise is a great way to burn calories. I use the spin bike often during the precontest fat loss period for figure competitors. The key is to push hard on the spin bike so that you get the maximum benefit when you move on to your resistance exercise.
The video below shows the:
spin bike + jump squats
spin bike + Db squat presses
Turn the tension up on the spin bike so that it's difficult to pedal. Push hard, your leg muscles should be burning by the time you get off the bike.
Workout idea:
(perfrom the following 9 sets without interrupton - this is one giant set)
1) 100 reps on the spin bike + 20 jump squats
2) 110 reps on the spin bike + 20 jump squats
3) 120 reps on the spin bike + 20 jump squats
4) 130 reps on the spin bike + 20 Db squat presses
5) 140 reps on the spin bike + 20 Db squat presses
6) 150 reps on the spin bike + 20 Db squat presses
7) 160 reps on the spin bike + max pushups
8) 170 reps on the spin bike + max pushups
9) 180 reps on the spin bike + max pushups
It's important for anyone getting ready for a figure show to constantly try to force the body to lose body fat. Sometime switching the type of workout can be the spark to keep fat loss going.