Jim Russel
Lord Nagafen Raider
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You burn more fat per unit time doing hiit than a low intensity workout. However, you would still burn more fat total running slowly 10+ hours per week than you would doing a couple hours of hiit per week. This is a fair comparison because there's a low upper limit to the amount of hiit you can do without risking overtraining or injury.What? I don't know about fitness - but for fat loss, HIIT is much, much better than standard cardio. Fasted walking at a decent pace is also decent for fat burning
Presumably fasted walking is advocated because insulin prevents fat burning? I guess this is a good idea if you're just trying to lose weight, and relies on similar concepts to what im advocating. However, not eating before a workout that's longer than an hour limits performance (and inhibits recovery). Your body needs a small amount of carbs to burn fat. On a fasted walk you're probably not burning enough energy to deplete the carbs stored in your muscles, but if you want to go for longer, you'll need some carbs to promote that fat burning.
To maximize training, ideally you would eat a good meal with complex carbs, fat, and protein several hours before a long workout. You would only eat enough during exercise to prevent bonking in a long workout. Too much sugar would raise your insulin and make the workout less effective.
If you really want to lose weight, doing 10-15 hours a week of exercise at or below 75% of your maximum heart rate is probably unbeatable (athletes can go up to about 80% while still staying in an entirely aerobic zone, but that takes training).. Of course, you need to build up to that volume safely. And that's a shitload of time to invest in fitness if you have fulltime job and other responsibilities