This is a question that many people ask. The truth is, there is no simple answer as it depends on what your goals are. You may want to lose weight, increase cardiovascular fitness, train for a marathon or build muscle… but whatever your exercise goals are, even a short workout  is better than no workout!

Watch this fitness report to see how long a new American study, found that women should exercise a day if they want to lose weight.

[youtube=http://www.youtube.com/watch?v=i4PyQ7UFkmo]