Oooooh I've never managed to do the splits. I bet I would be so inflexible right now - maybe that's something I can work towards. My sister owns a dance school and the flexibility of the people going through the classes is outrageous.
If you want to work on your general flexibility, I recommend Phrakture's Starting Stretching. For splits, their Attaining the Splits is also very good. I'm thinking pretty seriously about taking dance classes, even though I'm the whitest dude alive on the floor.