Having a strong grip for deadlifts is important. You can't deadlift what you can't hold on to. The thing is, grip work is boring.
By ditching the straps and getting in some high reps on one-arm rows, you're killing two birds with one stone. It's bad-ass hypertrophy work for the upper back mixed with holding on for dear life for a couple of all-out sets. Do 20-30 reps here, Kroc-row style.
A forward lean on lunges increases the recruitment of the glutes and hamstrings. The dumbbells should be on the side of the front foot in the bottom position.
Gary Homann isn't your garden variety weightlifter. Sure, he's 180 pounds at 6% body fat. Sure, he had the best 500 meter indoor rowing time in the world last year in his class and he's been an ACSM certified health and fitness instructor for the past nine years. But Gary's also got a Master's degree in applied health psychology and is currently working on finishing his Ph.D. in psychology.