It's a playground for cyclists, a perfectly formed loop around Regent's Park that packs all the main ingredients of a good bike ride into just 5km. It's got the chats, the climb, and the city escapism despite being just off Marylebone Rd.
Regent's Park is also a great place to learn how to ride around other cyclists. Be predictable and smooth, and be aware of your surroundings. Tick off laps until you're done for the day, and head to the Inner Circle for coffee.
Best served before or after work, as a mid-week spin.