Progress

"I just can't go heavy."

You can always get medium sets of medium reps with medium weights. It's like what Socrates tells Dan Millman; basically, this is like lukewarm tea, "the Devil's brew!" Medium is the death song for training. You can train medium (also known as "crappy") for years and years while making no progress. Let's be honest, go find average in everything. Buy the damn pale green, four-door Ford Escort of your dreams and go wave at hot babes. Get all C's and then ask your counselor, "What's my skill set?"

In other words, training a lot at lousy is still lousy. If you "can't go heavy," back off until you can!

From Dan John in this article.