More is not necessarily better when it comes to cardio. This is good news for those of us who are easily bored.
Unless we are training for a century ride, a marathon, or something similarly long and endurance-based, we do not need to spend hours and hours on steady-state cardio. In fact, the data suggests we get more benefit from shorter workouts with high-intensity intervals.
What does that mean in practical terms? No more hour-long walks on the treadmill. Spend twenty minutes or half an hour. Warm up for five minutes, then alternate bursts of speed of about a minute with recovery periods of one to two minutes. This works with all the cardio equipment in the gym or out in the real world if you are running, biking, swimming, or pogo-sticking. Then cool down for five minutes.
Not only does this form of training help our cardiovascular systems learn to recover more quickly, it also motivates our metabolisms to burn more calories. Win!