Spring is a time of change, and I think it is a perfect time to switch up your fitness routine. If you're starting to dread your Pilates mat class, might I suggest experimenting with a boot camp of some sort?
Pilates is great for training the small muscles that support your skeleton, while boot camps (like TRX and CrossFit) target the larger muscles. You can put your well trained Pilates posture to work while doing squats and lunges, and challenge your well honed Pilates core in a whole new way. It is a good idea to train your body in a variety of ways to keep yourself injury-free and to prevent workout boredom. Not sure how to find a boot camp? Check out this list of CrossFit affiliates.