To trim down your stomach and get toned, you have to build muscle; to build muscle, you're going to have to hit the weights. For the next 10 days you’re going to lift for 9 out of 10 days.
Perform your lifting workouts at night; interval training will be a part of your morning routine.
Here are your splits:
Day 1: Legs
Day 2: Chest
Day 3: Back
Day 4: Shoulders
Day 5: Arms
Day 6: Off
Day 7: Legs
Day 8: Chest
Day 9: Back
Day 10: Shoulders