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Yes well to get lean you need low weights with high reps, make sure you are able to perform at least 20 reps regardless of the exercise. Yeah so high reps equals toned and lean while low reps is what you need to get bulky and chiseled.
However, muscle is hard to put on initially, and for skinny guys typically requires 4-6 workouts per muscle group to build (you can build even faster if you lift twice a day, but if you do that, youâll need to take a full recovery day at least once a week, and allow at least four hours between workouts).