You know the deep burn you feel in your muscles after sprinting up several flights of stairs or pounding out 12 to 15 reps on your last set of heavy squats? That’s the result of metabolic stress, which is the accumulation of waste products from anaerobic energy production, and research shoes that it can be a powerful stimulus for adaptation (i.e., muscle growth). Want to maximize metabolic stress? Do moderate-duration, high-intensity activities that causes burning in the muscles; think 45 seconds of max-effort bodyweight squat-to-presses or lunge-to-curls, or 30 seconds of max-effort sprinting.

A good pair of legs is as important to the body as a good set of wheels is to a car. But like a quality set of wheels, strong, healthy legs come at a high price. So, don’t take the following powerful legs exercises — especially the sissy squat—lightly. Because this is an incredibly intense workout that will turn your thighs into killer wheels. Serious focus and intensity are required.


Weight trainers don’t usually expend the amount of energy in training that endurance athletes do, so they don't have to be as acutely aware of the intake of carbohydrate required to fuel such effort. For example, a marathoner or triathlete may require 7 to 10 grams of carbohydrate per kilogram body weight per day (3 to 5 grams per pound). This is a lot of carbohydrates—equivalent to more than 32 slices of bread for a 150-pound athlete.

For every person who lifts weights these days, it seems there are two who have a podcast about it. There are more bodybuilding tips promising greater strength and muscle than ever before, and along with them a ton of confusion; one buffed-up Instagrammer says lifting heavy will get you swole, while a well-known fitness personality has claimed in recent years that two 30-minute workouts per week netted him 34 pounds of muscle in a month.
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