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It’s true that low rep workouts, consisting of powerful and explosive movements, will build more size (but not less definition) than high rep workouts, because the “fast twitch” muscle fibers required in explosive movements are much larger than “slow twitch” fibers required for more enduring tasks. But really, for mass, wouldn’t you want to recruit all possible muscle fibers and not just the fast twitch? Likewise, for “definition”–that is, losing body fat so the striations in your muscles show more–wouldn’t you want to recruit all possible muscle fibers, especially since the number one factor affecting our resting metabolic rate, and thus fat loss, is muscle mass? The only thing you should alter depending on your goal–whether it’s to tone or bulk up–is nutrition.
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