Raph didn't even break a sweat as he climbed the thing. Like Cassie, he made sure to let Nico go first. Just in case. That meant there were two people that could snag her if she fell.

It wasn't that she wasn't tough but Cassie and Kon were naturally at peak human (ish?) condition and he was used to four hour work out warm ups and occasionally hours of fighting at a time. Nico ran a little more average on physical condition.