Just wanted to add here that I met with Dave last weekend to discuss my training options, and I could not be more satisfied.
I have the 'skinny guy' problem, where I'm not out of shape in any way, fairly athletic, but I just can't put on any muscle mass. Dave taught me some new techniques with correct posture and form and gave me a workout routine that will help me build muscle mass instead of just burning calories. He also taught me more effective (and time saving) stretching techniques and gave me some nutrition advice and ways to limit wasting the precious amount of calories in my system. I generally can get out of the gym in around 30-40 minutes depending on how many people are in there, and I feel like I've received a real workout thanks to the full-body exercises Dave recommended for me. When you can feel every major muscle group in your body pulsing you know something is right.
It's been about a week now and I have already starting adding weight to my workout, which is a sure sign that I am progressing way more than before. Dave is a real pro, and I recommend that anyone who is serious about their fitness goals should definitely meet with him.