Dr Karl

And so if you do this regularly over a graduated period, you get stronger.

If you do absolutely nothing and just lie in bed all day, you will lose 30% of your muscle strength at the end of a 24-hour day of lying in bed, not even getting out of bed to wee or eat or anything.

And it goes like that.

And as a result of the astronauts in orbit, even though they spend two hours a day doing exercise,

If they've been up there for, say, nine months, mate, you've got to take them out on a wheelbarrow.

They can't even stand up in this gravity, even though they exercise for two hours.

So the reason your muscles are getting bigger because of these microscopic tears that make the stem cells make new fibres.

And look up TikTok or look up for the videos of actin and myosin.

There's some great videos on that.

Okay.

Can I just ask a related question?

Do things like creatine and all that help in that care repair?

They don't help, but they act as a substitute for ATP.

ATP stands for adenosine triphosphate.

It is your energy molecule.

is equivalent to a dollar bill.

We don't have dollar bills anymore.

We've got dollar coins.

$5 notes?

$5 notes, right.