To determine the best exercise to lose weight is very much debatable.
There are videos and regimens out there that say it will give you the best results.
Many of these workouts are designed for specific areas such as the upper/lower abdominal, thighs, and chest and so on.
If you want to lose weight as a whole, you do not just work on 1 area of your body, you need to do cardiovascular exercises such say jogging, cycling or swimming.
There is really no best exercise to lose weight or burn fat.
The best regimen is the exercise program that you are comfortable with and increasing the intensity slowly and you can perform and adhere to the program realistically every day.
Spend 30 to 60 minutes every day is the key to weight loss.
Make it a habit and even better, make it into a hobby.
It could be swimming, cycling, jogging or going to the gym.
The important thing here is consistency.
Once you are comfortable with the program, start pushing yourself further and increase the intensity of the workout as your body will get use to the regimen and may not work as effectively.
You also need to remember that taking chemicals or pills are not the best way to losing weight fast and safe.
The best way to lose weight fast and safe is to have a healthy diet and workout regularly.
Eat healthy food like whole grains, lots of fruits and vegetables, drink lots of water and avoid oily or high sugar content food/drinks.