> And on the other side because I think a more aspirational look will push you more than a strictly realistic one. If I see the muscled guy bouldering I think how I could become, and it just looks "easier". While if I see a regular person who can barely hold onto the wall I just think of how bad the experience might be and could end up not even considering it.

This is the part I pretty strongly disagree with you. There is a reason "Comparison is the thief of joy" is a popular saying. People are pretty quickly going to be exposed to the reality of the situation, at which point the gap between their fantasy and reality will be a huge demotivator.

In any case, there are lots of free stock image sites you can use to find images that actually depict reality. Not saying they aren't staged, but there are lots that I think would be "friendlier" to newbies, which is what your site is about.