If you need a quick energy boost, use bodyweight programs. Many options are out there, pushups, planks, pullups, crunches. Start with cycle 1,2,3 like 1 pushup, 2 pullups, 3 situps and so on. Also do more reps slowly with time.
Another workout type that burns fat and makes muscles too. weights and bands are great in the gym as well as home. Resistance is good since you burn fat even 48 hours after this training. A full body workout like this is good to be made 3 times per week. And, always have proteins before this, for better recovery in muscles.
If after the resistance you still have time left use it for cardio. This targets all the fat areas perfectly. If not, do the cardio the next day but that that have fats prior the cardio. And, even better- do 2 short cardio sessions, in morning and at night.
To make the core strong is crucial for the belly fat so make more ab workouts. The belly sadly, cannot be spotted for the fat areas only so do all such workouts; jackknife, reverse crunch, regular crunch and so on. Also work on all parts; upper, middle, lower.
Try all of these, also short cardio sessions divided in the day and this will boost the metabolism perfectly to melt fat while you sleep.