[blipvert]

That is an insane amount of training - big lifestyle changes!

I increased my calorific needs by 1000 a day by doing a 10K run (1hr) before breakfast.

Still a 160lb weakling :)

[nradov]

That seems high. Someone your weight would generally only burn about 750 kcal on that workout.

[alex-korr]

750 kcals is insanely high for a 10k training run. If you hold your HR to Z2, 620-640 kcals would be my ballpark expectation.

[blipvert]

It’s what Strava says I’m burning so I can only go by that. 750 would still be above the low end of the range quoted by the OP.

The amount of extra food I needed to start eating!

[nradov]

You shouldn't go by Strava numbers, they are known to overestimate.

[blipvert]

Fair enough but it’s still going to be at the low end of the range 700-1000 range given earlier for 100lbs of muscle gain.

I’m ~75kg. Schwarzenegger was ~120kg in his prime. 45kg difference is (2.2lbs to the kg) 100lbs (differences between UK and USA imperial notwithstanding).

The chances of me going from where I am to a AS physique is zero!