Low repetitions (1 to 5): This rep range allows you to use the heaviest weights, which puts your muscles under the highest amounts of tension. This increases the number of myfibrils in your muscle fibers. What the heck is myofibril? It's the part of your muscle fiber that contains the contractile proteins. Think of it this way: When there are more of these proteins to contract, your muscles can generate greater force. That is why 1 to 5 is an ideal rep range for building strength. And, of course, more myofibrils increase the size of your fibers, making your muscles bigger!
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