[Kryptid]

Today, just for the sake of it, I decided to test your claim with an experiment of my own. I put on a backpack, added weights to it, put weights on my ankles, held weights in my hands and, for good measure, hung a computer-carrying bag around my neck. The total amount of weight was 62 kilograms (I know this because I measured my weight with a scale both before and after I put all the weights on). Then I tried to see if I could still stand on my tip-toes despite carrying all that extra weight around.

I could. Without much trouble, either.

So each one of my calf muscles easily lifts much more than 31 kilograms (because that's not counting the weight of my own body). I don't even include calf exercises in my workout routine, and I'm a fairly average individual in terms of height and weight (well, for an American, anyway). So this pretty much proves that calf muscles in an average person are capable of lifting a 60 kilogram body. So I know from personal experience that you are wrong.

[Bored chemist]

Your foot is on one end, but what is holding the other end of the scale?

At the end of the iron bed.

Try again, with a shorter rope tied to the scale + bed.

[Yahya A.Sharif (OP)]

So each one of my calf muscles easily lifts much more than 31 kilograms (because that's not counting the weight of my own body).

I don't know what an average person can carry and how stronger you are  .What you are doing is feeling how easy it is .If you lift your body with calves muscles" , you will find out you will  literally not  exert effort on lifting your body and you will do it many times.

 

hen I tried to see if I could still stand on my tip-toes despite carrying all that extra weight around.

I could. Without much trouble, either.

My idea includes  small normal force on toes and that will give small pressure on toes and that why you could stand on toes tips

[Bored chemist]

Did you lift with effort ?

Why did you ask that when it had already been answered?

Without much trouble

[Kryptid]

I honestly couldn't figure out what you were trying to say with your last post.

I was able to prove that calf muscles can easily produce over 60 kilograms of force together. This is in contrast to what your claim is.

[Bored chemist]

Essentially, the claim that your leg will only deliver 17 KgF is impossible. You just aren't measuring it properly.
Here's some data where the strength of the triceps muscle of the arm was measured.
Typical values are about 700N or about 70Kg.

If these people- even after not using the muscles for weeks are able to exert forces of 70Kg with an arm muscle, there is no way that you can only produce 17Kg using your leg.
Not to mention that fact that you wouldn't be able to stand up.

You are fooling yourself.

[Colin2B]

Essentially, the claim that your leg will only deliver 17 KgF is impossible. You just aren't measuring it properly.

Agreed.
Look at this way this experiment was set up with straps to prevent the body sliding away from the scale. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6107699/
Obviously this wasn’t an attempt to measure maximum force, but the principle applies.

[Kryptid]

I'm pretty sure that an object moving in the opposite direction of net force violates conservation of momentum, too.

[Bored chemist]

In fairness, I think we should accept that the OP's response, while mistaken, is not totally without foundation.

It's 40 years since I was in a gym with"weight training" kit.
I was surprised whenI found out just how much you can lift if the load is properly supported.

Let's be clear about this- I was a nerdy 16 year old.
I decided to do weight training because school required that I did some sort of "games" and this was warm, indoors and not particularly  competitive. I was no "gym bunny".

But I worked out how to "game" the equipment.
I would bet the big strong (foolish) lads that I could lift more than them.
And I did.

The easiest bet to win was  "Do you think I can lift twice your weight?"
None of the "beefcakes" thought I could do this.
I knew I could

One of the machines was, in principle, a simple lever.
It was pivoted at one end against the wall - about 170cm above the floor.
Near the middle it had a big adjustable stack of weights. The weight you "chose" was decided by where you put a steel pin in the stack.
And, at the end it had a padded bar that was designed to rest across your shoulders.

The idea was simple, you squatted under it with your shoulders against the padded bar and stood up, thereby lifting the weights.
If I remember rightly (and I probably do- I'm like that) the total weight stack was 237.5Kg
Yes, nearly quarter of a ton.

The way to win the bet was to ensure that the pin was in the weight stack, but you put it there when you were nearly standing up- rather than squatting. That way you use your calves , rather than your thighs.
And then, using your calf muscles, lifting the whole stack wasn't that hard.

OK. some of you reading this will be thinking  I'm bull ****ing.

There's a tradition in the uk that the first time a man and his wife enter their house after getting married the man carries his bride across the threshold. It's reasonable to say that most men can do this.

A man typically weighs 70Kg and his bride 65Kg.
So the evidence of tradition suggests the  man can carry a total load of 135Kg
But, as he walks, he uses one foot at a time
So each foot (and thus each calf muscle) can lift a weight  of 135 Kg

So, using both calves it's reasonable to imagine them lifting  270Kg.

This isn't some magical idea- it's just the fact that we are much much stronger than we normally think.
Iwas making a bet that I could, with both legs, lift a load that I had a fairly good chance of being able to lift with just  one.

I made pocket money  on the basis of the same misunderstanding that the OP has.
He's wrong, but he is in good company.

[Yahya A.Sharif (OP)]

This is an accurate test giving maximum 8 kg force for calves muscles .And in the video I can raise and move my body 57 kg several movements effortlessly ,exerting force less than or equal to the maximum 8 kg.The force used to raise and move my body is far less than my massive weight. .

[Bored chemist]

This is an accurate test

No, it is not.

Or rather, it might be a good test of the spring constant of the balance (and whatever is folding it.) but it's a lousy test of what force your calves can produce.

[Kryptid]

The fact that you can lift your body with your calf muscles is proof that your calf muscles are producing more force than your body weight. Any claim to the contrary is straight-up nonsense and ignores how math works.

How about trying an experiment like the one I did? Put on some weights and see if you can still stand on your toes.