In three or four weeks you can lay a good foundation. It's unlikely that, unless you have a very low percentage of body fat, you'll be able to see any muscular development in three weeks. Your poundages, however, should increase, which will demonstrate a strength gain. There's no trick to it. Train hard, plenty of rest and sleep, and eat properly.
Do the basic, multi-joint exercises, namely, squats, deadlifts, presses, rows, dips, and chins. Focus on overall growth. You can also use other multi-joint exercises such as farmer's walk or sled pulling, but generally avoid single-joint exercises. You must eat correctly. For example, you should be ingesting plenty of protein from natural sources and avoiding refined processed carbohydrates. Drink plenty of water. Avoid over-training and get plenty of rest. It's better to think of it as a lifestyle. For the free exercise and eating plans to get you started, see the page links, further down this page, listed under Related Questions.
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Practically - Not Possible.
Gaining 1 to 2 pounds of muscle in a week is achievable but very difficult for a hard working body builder who eats and workouts religiously.
5 lbs of muscle in a week is impossible.
You can gain 5 lbs of fat in a week if you just eat, eat and eat...
Muscle mass must build slowly over time. Research has shown that muscle mass only increases after several weeks or months of continual loading.