Join the gym, run up a mountain, sign up for spin classes. We are constantly being told to go to great lengths - and get very sweaty - to get fit.
What if you just don't have the time or inclination?
Jo Blodgett has the answer: activity "snacks" that you can almost effortlessly add in to your daily schedule.
Blodgett is a senior research fellow at the Institute of Sport, Exercise and Health at University College London and has studied the impact that small bursts of action can have on your health.
High intensity exercise - getting out of breath, getting your heartbeat up - is really beneficial, but it is only part of the picture, she told Radio 4 podcast What's Up Docs?
