If you are seeking to reduce your "belly" then the workout you have been given will not be enough to achieve your objective.
It really depends on what you want to achieve. Cardio alone will help you achieve your objective of losing the "belly".
But the most effective way to gain strength and muscle whilst losing the fat is to do circuit training.
You must do at least 40 minutes of mid-high intensity workout that elevates your heart rate up to 80% of your Max Heart rate.
To work out your Max Heart Rate - Subtract your age from 220.
E.g. For a 25 year-old
220 - 25 = 195 (Max Heart Rate) - therefore, my target workout heart rate should be:
195 * 0.8 = 156bpm
I personally tend to push my heart rate to about 160-170 for my workouts. But if you are not used to intense workouts then i would suggest you keep to the target heart rate which you can workout from the above.
As for a workout. My suggested circuit workout:
- 10min run/jog at 5 degree incline and 10.5kmph
- 10min cross trainer at level 15 and 18 speed
This should be repeated at least 5 times with 60 second rest between each set.
10 Box Jumps
Why this type or workout?
The reason I suggest something similar to this workout above is because it will engage almost all of your muscles whilst elevating your heart rate. This will give you a well rounded workout and you should see great results within a couple months of this routine.
Make your own version guidelines
To make your own version of this just ensure that the exercises you choose are motion based. By this I mean exercises that require you to move a lot. So something like the plank doesn't really get you moving. But something like burpees is very good for getting you to move and engage many muscle groups.
Weights are good as you get stronger but make sure you can do at least 5 sets of the workout you make to ensure that it is sustainable. if you cannot then reduce the weight or change the workout.
Try this and see how you get on a couple months later...