You can’t be healthy without being fit. Exercise to the point of exertion is where the ‘good stuff’ is found. The harder you work, the greater the benefit. To be fit, you have to move, pant and sweat. Any questions?
Most people today train or exercise with a very narrow approach to fitness. They do one thing (like running, rowing, yoga, swimming, biking, etc.) and do it repeatedly for years. There are fantastic benefits to be gained from each of these individually, but on their own will not produce a well-rounded, truly fit person.
There are many excuses for not working out regularly: no time, no energy, no money, or all of the above. The good news: exercise is free. And, research shows that short interval, higher intensity exercise gives you better results than long, drawn-out journeys on the treadmill or punishing runs on the pavement.