The Right Cardio for Weight Loss

Most people know exactly one way to do cardio for weight loss: run — or bike, or swim — at a steady pace for 30 to 60 minutes, heart rate hovering around 60 percent of maximum. It works. But it is not the only way, and for many people it is not even the best way.

The second way is interval training: short bursts of near-maximal effort — sprinting for 10 to 60 seconds — followed by recovery periods roughly twice as long, repeated for 15 to 25 minutes. Intervals burn a lot of calories in a short session and produce a measurable afterburn effect, but they are demanding: beginners who start here often end up injured or discouraged.

The third way is fartlek — Swedish for "speed play." It mixes distances and intensities within a single unstructured workout: jog, then surge to the next lamppost, then ease off, then climb hard. Less rigid than intervals, less monotonous than steady-state, and particularly good for people who find structured programs boring.

Which is "right" for weight loss? The honest answer is less exciting than the question. The differences in fat loss between methods are modest once total effort and diet are accounted for; what matters most is adherence. Steady-state suits beginners and long-session people. Intervals suit the time-pressed and the already fit. Fartlek suits everyone who needs variety to stay interested.

So if you are bored, or stuck at a plateau, the fix is usually not a better method — it is a different one. Change the stimulus, and the body (and the mind) responds.

General information, not medical advice — check with your doctor before starting a new exercise program.