Often people start to exercise and they pick one activity like cardio, weights, Pilates and then put all their effort into that.  While on the whole this is not a bad thing you will get much better results if you do a variety of activities.  There are so many things from rowing, rollerblading, biking or climbing.   Try weight training with free weights if you normally use machines, kettle bells or even training with the exercise ball.  By doing a variety of exercises you will work more core muscle and hit different muscle fibers.  This will improve your condition and make you a better rounded athlete.  In return you will see better results.  So try a new routine or exercise, shock your body into better results.