And I’m not talking about interval cardio, although the weight-training method I’ve been preaching has an HIIT feel to it. That’s the F4X method, (featured in Old School New Body) which is moderate-weight, high-fatigue training with short rests between sets. It burns more fat and pumps up your muscles like crazy too. Here’s the drill:
You take a weight with which you can get 15 reps, but you only do 10; rest 30 seconds, then do it again—and so on for four sets. On the fourth set, you go to failure, and if you get 10 reps, you increase the weight on the exercise at your next workout. Notice how those sets are like intervals with short breaks between—you can even pace between sets to burn extra calories, but there’s more.
Fat-burning pathway 1: While that training style does great things for muscle growth, via myofibrillar and sarcoplasmic expansion, you also get loads of muscle burn. That lactic acid pooling has a spiking effect on your growth hormone output—and GH is a potent fat burner. Fire up muscle burning to get your GH churning. (GH also amplifies other anabolic hormones, so it effects both muscle and rippedness.)
Fat-burning pathway 2: If you do the reps correctly on every set, you’ll also get myofibrillar trauma. The myofibrils are the force-generating strands in muscle fibers. By “damaging” them with slower, controlled negative strokes, you force the need for extra energy during recovery. In other words, your body runs hotter while you’re out of the gym as it revs to repair the microtears.