I've been going to this gym for a few months now and I like it there.
It is definitely not a place to go if you want to see and be seen, i.e. Meat-market; it is a place where you go to seriously work out. The clientele is of a wide variety - young, middle aged and older, men and women. Most people just do their workout routines and/or use the cardio equipment, of which there are several varieties.
The staff and management is wonderful - they're always in a good mood and available for questions and/or comments.
The equipment is what you need to get your body in shape, not more and not less.
They have personal trainers at reasonable prices; I see Travis, who is a wonderful trainer and person.
In summary - if you're looking for a place to work out to get fit without any frills or be intimidated, this is the
place to go to in Renton.