Quitters never win.
Not that long ago I decided to do a half hour on the treadmill to get my physical activity started again. Ten minutes into it I was bored, my legs were a little tired, and there was no one around in the apartment building's fitness center to witness my lameness, so I hopped off the treadmill and went home.
All the pride I was feeling for getting off my butt and making it happen got sucked instead into a whirlpool of self flagellation and scorn. So not only did I not do anything really meaningful for my body, I deflated my own spirit out of sheer laziness and apathy.
In total contrast, last year when I worked out at the gym, I made it a habit of finishing all my reps. A friend and personal coach suggested that when I got to the end, and had given all I had to give, that I attempt to do two more reps. To push myself just that little extra and to reap the extra rewards.
It was an amazing feeling. I would do 12 curls and my arms would be shaking, but I'd eek out two more. Or lunges. Or squats. Or...whatever.
I can't convey in adequate words the sense of pride and accomplishment that washed over me knowing I really and truly gave it my all. My body benefited as I got stronger faster, and my psyche benefited as I showed myself a true grit I didn't know I had.
My advice to you today (and to myself) is this: If you are going to do a thing, do it to the best of your ability. Don't quit when you finish your 30 minutes on the treadmill - do 5 more. Don't quit at 12 reps - do two more. Don't quit at 20 burpees - do two more (if you don't know what a burpee is, Google it and thank me later.)
But if you can't go the extra mile, don't be a quitter and not even finish what you started. Don't reinforce by your actions that you can't do something. Instead, prove to yourself you can.