Slow-twitch muscle fibers are mostly used for long endurance exercises like aerobics, swimming, and distance running. Fast-twitch muscle fibers are generally more powerful and are activated during maximum exertion exercises like heavy weightlifting and intensive, short bursts of sprints. — David Kirsch Copy Share Image
I'm sure strength-and-power people have been using kettlebells for years, but that doesn't necessarily mean they will work in a general training program. — David Kirsch Copy Share Image
You want to have fun and try new things but also shock your muscles with new workouts so that you keep your body guessing… — David Kirsch Copy Share Image
Your body is smarter than you are, so you always have to stay one step ahead. — David Kirsch Copy Share Image
The point of workouts are no longer to do double 60-minute sessions or go to classes five times a week. You don't want to… — David Kirsch Copy Share Image
Ideally, we should be controlling what we eat by cooking for ourselves. — David Kirsch Copy Share Image
Clients like Kerry Washington stay energized by substituting high carb, high fat foods with a diet rich in lean protein and low-calorie, fiber-rich vegetables.… — David Kirsch Copy Share Image
In my experience, working with a bride-to-be, the last couple of weeks leading up to the wedding is uber-stressful. — David Kirsch Copy Share Image
Despite popular belief that watermelon is made up of only water and sugar, watermelon is actually a nutrient-dense food with a high amount of… — David Kirsch Copy Share Image
Slow-twitch muscle fibers are mostly used for long endurance exercises like aerobics, swimming, and distance running. Fast-twitch muscle fibers are generally more powerful and… — David Kirsch Copy Share Image
You need to stick to a workout that fits into your lifestyle, targets your body issues, but also correlates to your objectives, whether you're… — David Kirsch Copy Share Image
Women often use weights that are too heavy. I like to stay in the 3- to 15-pound range. If you're more fitness-experienced, use weights… — David Kirsch Copy Share Image
