Rent + Utilities + Internet: 250
Groceries: 150
Ultimate Frisbee, Tennis, Cycling, Outdoor Gym: 0 (maybe 15 for equipment amortization)
Healthcare: 0 (well europe)
Travel + Fun: 150
No kids and GF also works, but most people even with kids live very well with a 10 to 20K net income a year here.
I have over 200k income but I just would not know how to spend more without just throwing money out of the window as most stuff is basically free. But then this is also not US but a European City