When we run at a slow intensity over a long period of time, the body is primarily using fat stores, but due to the low intensity, when we have finished that run we stop burning the calories. There is however, ways to speed up the metabolism so when training has finished, the body carries on burning.
1. Use weight training
A lot of females will have their doubts straight away with this type of training, thinking that they will look muscular or manly, this is NOT the case. Due to lower levels of testosterone in females, they will not put on anywhere near as much muscle mass as men, but will feel much 'tighter', and more toned. Another up side of this training is that if you have slightly larger muscles, they need more energy to move (like a car engine, bigger engine, more fuel), so just doing your day to day jobs will burn more calories.
The men will have all the same benefits as the ladies but should put on a little more muscle mass (depending on the number of sessions per week), which is never a bad thing.
2. Use interval training
Interval training in simple terms is training at a higher intensity for shorter periods of time interspersed with periods of recovery.
For example, run for 30 seconds, rest for 30 seconds, making sure that the period of work is at a much higher intensity than your slow jog.
Using this type of training may not burn as much fat whilst being performed, but due to the higher intensity, will speed up the metabolism, therefore burning more fat after the exercise is completed.
In summary, the trick is to speed up your metabolism, therefore burning more calories day to day, and using these two types of training are your best bet.