I'd suggest something simple, change up the routine a little, if you always do your routine in a set order, change it around. Second, sometimes I find a cup of coffee works wonders for my concentration level, put it in a "go cup" and drink it on the way to the gym. Finally, if you listen to music on an iPod or such, make sure it's music w/ a good beat--oddly enough although I'm not a big fan, ABBA can move my strides on the eliptical up by 5 to 10 a minute without any apparent effort. It's the beat, obviously not the quality of the music. I mistakenly start a track of ballads, and it really pushed down my energy level.