Can see how that started of as a good idea, why not multitask right? Hehe. I have done similar things. Texting and writing while on a exercise bike. You dont notice how much extra you do whilr being distracted by other things.
It's a good thing though. If it hurts it means it's working! Good job mate! Let the pain be a reminder of your hard work. =)
Or you know I have a slight addiction to the feeling/chemicals being released from pumping iron.
Hehe, then keep pumpin away! =P I also like the feeling after a good workout.