If appropriate to the method of exercise, listen to good music-- i think that is the key to staying motivated during workout. When I cant hear my breath I feel less tired and really push myself. Music is great while jogging in a safe place or riding a stationary bike. I personally find it very hard to jog in the morning, both to actually get out of bed and to maintain a pace. My joints just dont seem to want to move and i get out of breath quickly. But if it works for you, its the best way to get your body moving for the day.
If indoors, do some Pilates or some other aerobic exercise that combines cardio with strength, flexibility, toning etc. Jumping rope is also one of the best forms of exercise.
Swimming is awesome too!
In short, there's lots of stuff you can do, it just depends on what you enjoy... or hate the least