We all learn differently, so this one is for my visual learners.
We talk about 'getting tight' in regards to the big three. The how is one thing, but I want to at least demonstrate the why with this video. So strap in for a solid 3 minutes and hopefully this clicks for some of you...
[youtube=http://www.youtube.com/watch?v=gCdT5xWIYaI&feature=youtu.be]
Common examples of not being tight or energy leak...
Squat - weak core or weak upper back resulting in being folded over in the squat (the ol good morning out of the hole)
Bench - elbows flaring too much or too early off the chest, or ass off the bench (energy from leg drive leaking into hip extension instead of getting back to the bar)
Deadlift - rounding forward right off the floor - weak upper back, lats not tight, poor positioning from the start