guerrilla cardio
ill explain
pedal for four minutes at moderate intensity
then increase the resistance and pedal for all your worth for 20 seconds
then to a light pedal for 10 seconds repeat until at 8 minutes,including the warm up then a 4 minute cool down
3 times a week in the morning before eating is ideal
this can also be done in the form of road bike,sprints ,and swimming
if anyone wants more info on any other form ill be happy to type it up
good luck