Pilates is a great all round strengthener and toning class. Core exercises aid you in all sports by giving you all round strength balance etc etc. The stretching element of is also great when you are doing intensive workouts the whole week. I generally do it in the last hour of training. There are so many benefits to it  I cannot even start telling you about all of them but will give you this link to a great 10 of them

Personally I have been doing it consistently only for the last 5 months and I literally can feel my Abs wanting to pop out. It has greatly improved my flexibility and posture too. I am Spaddicted to it for sure and see myself doing it all the time.

www.spaddict.com