If you are looking at staying fit this summer, Scottish Ballet posted a Core De Ballet exercise video on youtube a while back, and I would recommend taking a look at it and trying some of the exercises.
“Scottish Ballet’s Core De Ballet, a specialised introduction to core-based ballet exercises. Join Gyrotonics Instructor Kate Menzies and dancers Luciana Ravizzi and Luke Ahmet for a 15-minute exercise routine designed to stretch, tone and energise.”