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

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.

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!

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

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!

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