You could go to the Retiro park to feed the pigeons, or you could make your trip count double with Calisthenia Retiro Train. You will leave the park trained and liberated. Group sessions of no more than 20 people are prepared for all levels, and there are three types of training modalities: freestyle, static and basic. In case you did not know... Retiro is much more than boat rides or skating lessons.
Classes are taught outdoors and with music. The atmosphere is fun. You have to be prepared with sports clothes and shoes, and bring something warm, breathable, on cold days. You can park on the street more or less well, although there are paid parking spots if you have no luck. Nearby metro: Atocha, Retiro and Ibiza.
And get access to 161 gyms and studios in Madrid with one membership