the extra-curricular offering is huge, there are clubs and societies for everything you could want - knitting, Japanese, sailing, coding, ceramics, chess etc etc - again, think uni-style. the school day is structured around a long lunch break, so there is a generous amount of time to fit in a lunch time activity each day; clubs also take place before school, at first break, and after school.
there are massess of opportunities on offer and Admissions do clearly look for kids that will take advantage, and who want to learn/explore/stretch themselves etc.
but if you fill every gap it can be hard to find breathing space in the day, and we've had to pare back my daughter's day a bit as she signed up to loads of things last term and it just proved to be too much.
our DD is musical not sporty so i can't comment so much on the team sports side of things, but the sports provision from what i've encountered seems supportive and 'have a go' inclusive and everyone has a place in a team from As to Es.
my impression is if you are sporty that's great and there's lots to do - they are certainly competitive. but if you're not, that's ok and you won't be pushed into it - there is an understanding that everyone has their 'usp'.