What is the best exercise to reduce tummy fat?

Lose wt, aerobics: Probably the best way to lose tummy fat would be to lose weight using aerobic exercise such as walking or cycling. Also you can work on strengthening your abdominal muscles. If you don't lose weight you probably not have the washboard abs one strives for.

Planks: Try planks. You hold yourself as if you were going to do push ups but don't go down. Hold as long as you can, then you can work on side planks to define the obliques.