If you're like most people, you want more muscle than you have right now, but you’re busy and you don’t have much free time to go to the gym and lift weights. If that's you, I have good news: Science has uncovered two highly effective training methods that can reduce the length of your workouts by up to 50 percent, while still delivering identical gains in size and strength. Here’s what they are and how to use them for the best results.

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