Unless you workout as soon as you wake up, think about your workout during the
day. Think about the workout you will do, the exercises, the reps, the sets, and
what you want to accomplish. If you have the proper motivation, you will feel
excited. If you aren't sufficiently motivated, you won't be excited about
working out. (This could also be a sign of over-training.)
Guys, look at the girls every now and then. Girls, look at the guys every now
and then (if that kind of thing gets you excited, if you aren't single, I'd
recommend skipping this step.) Controlled studies have revealed higher
testosterone levels in males working out in a gym with posters of girls wearing
bikinis for a certain amount of time as opposed to the same males working out in
another gym with no girls on the walls.
Try to impress people. When people walk by or are watching you workout, work out
as hard as possible and do as many reps as you can. Whether you impress people
or not, you want them to know that you are a workout animal.
Still need some help getting motivated? Think about something that really gets
you worked up. For me, it is my football coaches screaming at us and pushing us
to get better. (My intention is not to get mad at them or anything, but it helps
me to remember the intensity that I expressed and it allows me to get myself
back to that level of madness.)

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