I just started lifting weights and was doing a lot of cardio and trying to get bigger at the same time, which I now realize may have been a huge waste of time. I wasn't getting any stronger for a few weeks and was starting to get frustrated. I cut down on the cardio from 45 minutes to an hour of hard cardio 4-5 times a week to 20 minutes twice a week, and all of a sudden I am much stronger and can lift more weight on almost every exercise. I'm wondering if doing too much cardio was burning up all the extra calories I'm eating and diverting it away from growing stronger, or is it just a coincidence that I am so much stronger all of a sudden?