Myth #2: Building muscle will make you slower and less flexible.
Contrary to what you might think, building significant amounts of lean muscle mass will actually speed you up rather than slow you down.
Muscles are responsible for every movement your body makes, from running to jumping to throwing.
Why am I building muscle so slowly?
Your calorie intake: If you don’t eat enough calories each day, even if you eat a lot of protein, you won’t build muscle.
Your lifting routine: If you’re trying to build muscle, you need to be aware of two key concepts in strength training: frequency and volume.
Does the muscle accelerate?
The quadriceps help straighten your leg, and they help bring your knees up toward your chest.
Your quads play an important role in your body for speed training.
The stronger your quads, the faster you’ll go.
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You can still run a good 10K, half marathon, or marathon when you’re putting on enough extra muscle, but I’d say that extra muscle will hurt you more than it helps you.”
Does lifting make running faster?
1) Weight training is always as heavy as possible and therefore always slow.
2) Weight training makes you gain weight and it slows you down.
Not all weight training is the same.
Just like you don’t run 400m at the same speed as you do in a marathon (unless you’re Eliud Kipchoge, maybe).
More muscle = more power and more economy of motion, which means faster.
However, if that muscle gain is in the context of a general increase in body size (not just muscle gain, but overall weight gain), then yes, you will be slower simply because you’re moving more weight.
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Should stretching hurt?
Stretching should never be painful.
Pain should not be a part of your stretching routine.