Which ocean extends from the North Pole to Europe, Asia, and North America? Atlantic Ocean
Southern Ocean
Arctic Ocean
Pacific Ocean

Yes it can, however; doing this exercise for a long period of time can have little or no effect as your body will get used to the strain you are putting it under. Try 20 minutes with another type of exercise for a couple of days then 30 minutes plus a DIFFERENT exercise. Up your minutes every 3 days or so so your body does not adapt to just one certain movement.