I've started rollerblading with Shiner (our dog). Since we got Dish Network, we've been watching a lot of Dog Whisperer - the show with Cesar Millan.  He is always talking about releasing the dogs energy and one of the examples we have seen him do to release dog's energy is to go rollerblading with the dog and the owners. 

When it starts getting closer to bedtime, Shiner starts running around the apartment with a squeaky toy and we figure it has to drive the downstairs neighbor mad.  I usually try to stop her when she starts running around, but that probably keeps all her energy pent up in her.  Instead of just stopping her from running around, we decided to start helping her release some of that energy by taking her out rollerblading.