Some Muslim men find it offensive to their beliefs and dignity to share activities with women and girls. Some muslim women will also feel very uncomfortable running in the presence of men.
Indeed. But as a minimum both men and women should be invited to participate and given freedom of choice instead of it being denied to females over age 12.
The real question is to Tower Hamlets council, how they are allowing their park to be used for this event, but given as its Tower Hamlets, I wouldn't expect any less from them.
It is appalling what Tower Hamlets council get away with. They are rotten to the core and it starts at the top with the current mayor Lutfur Rahman who was found guilty of electoral fraud (including bribery and making false statements) when he was mayor back in 2015 and removed from office. Despite this, he was voted back in as mayor in 2022 so it seems we are stuck with him. Which is, quite frankly, why Tower Hamlets is fucked. (And yes, I am a Tower Hamlets resident).
Edit: just to add that the last thing I would call Tower Hamlets is “uber liberal”. Left wing and liberal are not the same. The sexism and misogyny on display in Tower Hamlets, particularly in the area around East London Mosque is disgraceful and more reflective of the 19th century than the 21st century world city that London is.