Take your exercise regime out of the gym and into nature at Bubbleparc. It's a great spot to do some situps, crunches or even some yoga.
You'll be spoiled for sightseeing choice when spending time in Gothic Quarter. Bubbleparc is an ideal place to start here, but there are lots of other fine spots to consider. Sagrada Familia, La Rambla, and Plaça de Catalunya are not far from the outdoor sports and fitness area and will top off your day nicely.