My personal motivation is hard on occasion, especially if I miss even one session I'll get lazy and want to miss the next. What I've found that's helped was getting my girlfriend to go with me or you could even get a friend to go with you.
The most major motivation factor is when you see results after 4-6 weeks of whatever you're doing...but remember you have to keep it up or your results may deteriorate.
"Due to the mechanics of muscular development, often a training program incorporates lots of repetition within its workouts. This can become pretty boring after a while and may lead to your plan going off track.
Fighters, bodybuilders, powerlifters and many other explosive athletes all credit the power of motivation and outside inspiration for getting them out of bed each morning. Re-igniting that desire to succeed so they can spend yet another day challenging themselves in the gym.
The following list includes some critical methods on how to stay motivated especially when all else has failed and progress has rapidly began to slow down.
Revisit your past.
If you think everything is against you, take a really good look at how you were when you started. For most, you will begin to see how much you have achieved already. Remember what you did to get where you are now, you might get cold chills down your spine just thinking of all the hard work you put yourself through, but seek motivation in the fact that the hard work you did then is DONE, and by simply continuing with that positive attitude you will continue to see even better results."
Read the full article of at BMWW