Question: If you are heavier you will be stronger wether this is by fat or by muscle I think we can all agree on that. (I'm not talking about overly fat because at that point it would probably not hold true due to health reasons)

So if you have excessive fat, will you gain more muscle because you can lift heavier then the version of yourself who has the same amount of muscle but a lot less fat? Or am I missing something here?

Scenario:

Say there is a version of me of 70kg with 10% body fat and a version of me of 80kg which has the same amount of muscle mass but higher fat percentage. 

Both training the same exercises but lifting the most I can lift in a secure way, will the fat version gain more muscle mass?

Answer: 
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> If you are heavier you will be stronger wether this is by fat or by muscle I think we can all agree on that.
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On what do you base this? Apart from very few lifts where a bit more body weight helps you, I can't see a scenario that shows having extra fat helps you lift weights.

> 
> Say there is a version of me of 70kg with 10% body fat and a version of me of 80kg which has the same amount of muscle mass but higher fat percentage.
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> 
> 

No, absolutely not. If you literally only gained fat, and no muscle what so ever, you won't be stronger. (unless your central nervous system somehow adapted in such a way that you have more control over the lift) What often happens thought, is that you have gained some fat and some muscle, making you a bit stronger.

**The reason why you often see very strong dudes have a bit more fat** is because if you want to be strong, you have to eat a lot. Eventually you get to the point where it gets harder and harder to gain muscle without gaining fat. They don't intentionally gain fat, it just happens when you get to the point of eating x-amount of calories a day.

Also, don't confuse muscle size with strength. You don't always have to lift heavy to get bigger muscles. Training to get stronger is different from training to get bigger.
Muscles make you stronger, not fat, fat will make you slow and lazy because Muscle is more metabolically active than fat. Since muscle is denser, if you compare two equal sizes of fat and muscle, the muscle would weigh more. The density of fat is .9g/ml whereas the density of muscle is 1.1g/ml. these numbers can vary depending on numerous factors such as race, sex, or body type.

High body fat percentages are associated with raised risk for obesity-related diseases such as type 2 diabetes, heart disease, high blood pressure, and even certain cancers. The average everyday American woman should look to be somewhere between eighteen and thirty percent body fat, whereas men should look to be between ten and twenty-five percent.

Apart from fat and muscles other things also matter.

1. **smoking:** if someone smokes then he gets tired first in stamina based exercises.
2. **proper eating:** the one who eats properly and takes a balanced diet can generate more energy and have more stamina.
3. **Injury:** one cannot perform well if he is injured.
4. **diseases**: if one is suffering from any major or minor diseases then his body will not function properly and he will consider weaker.
5. **Bone density**: just consider someone is having stronger bone, obviously he will be more solid and stronger form inside. stronger bones means stronger base.