This has nothing to do with weight, but everything to do with physical fitness. If she needs a stunt double to make her RUNNING look convincing for a feature-length film, then she is not the right choice for a female superhero star!

A kick-a$$ female superhero movie needs to be made (asap!) but we don't need another unconvincing train wreck that will just allow critics to say "See? People don't want to see female superheroes in their own movie!"

A lead superhero needs to do more than just look hot in spandex and be able to glare (which pretty much sums up ScarJo's personal performance in Avengers. Except for when she's pouting/on the verge of tears to manipulate men she's interrogating (And I'm not counting her stunt double, Heidi Moneymaker's performance as part of ScarJo's)).