Jay Shetty

So people are more likely to just socially withdraw.

And now we're having all the secondary problems of social isolation and even physical activity starts to go down because people don't leave their house, they watch TV more, and this whole cascade of things start to happen.

And so we have direct and indirect mechanism there that say, again, you don't have to be massively strong, but just maintain some semblance of grip strength.

Your legs are going to tell the same story.

This is your interface with the world, your legs and your hands.

And so your ability to locomote, to move throughout the world is mostly your legs.

If you don't feel confident that you can walk up the steps to that museum, slowly you stop going on those trips.

You start doing that extra thing.

It hurts too much.

It's too exhausting.

Again, fill in all the blanks here.

And so having some sort of physical leg strength gives you confidence that allows general physical activity, which then pays all those additional benefits.

That doesn't even carry in account the direct physical benefits.

So if we start looking at muscles specifically, muscle quality, and this can be defined a lot of different ways, is going to regulate in part things like your blood glucose.

And you've, I'm sure, talked to many people about the importance of metabolic health.

Skeletal muscle is going to explain about 80% of the variance in your resting metabolic rate.

That's your faster, slow metabolism.

Again, 80% of the variance is going to be explained by how much lean muscle you have, for the most part.

So you don't need to be huge, but losing muscle is called sarcopenia.

You lose muscle faster than you should be with aging.