Dryslope for technique but I prefer indoor way more because you can actually practise things there without ended up being bruised all over.
Also this is how the park in the 'local' indoor hall looks: (really depends they change it every week)
My Tumblr: http://image-data.tumblr.com,
only stuff I create.
I'm a snobby cocky connoisseur of the finer things of life.