I have had personal training sessions for the last year (except a 2 months break for surgery), and I can honestly say that it's been the best thing I have ever done for myself. I too, like many of you tend to stay in my comfort zone, not really feeling like pushing myself when I'm on my own. That's why all my efforts before failed miserably. Now, it's different. The main thing I get from sessions with trainer is him motivating me, pushing,and making sure I don't hurt myself.
I still remember how achy I was after initial sessions - literally EVERY muscle in my body was hurting! Even now, when he changes the routine I am sore, but it's not so bad. I am seeing my trainer 3 times a week - I know, it's expensive, but I see it as an investment in my health and well being.
A question to all: how do you determine how many calories do you REALLY need a day? I have looked into different formulas, and I come up with different numbers every time!