 Welcome back to the School of Caste, this is challenge chosen number 70 and this one is Roy of Dave Street because he may not have mentioned it before but has got a master's degree in engineering from the University of Loughborough. How what class was it Dave? It was a first class with honours and best final year project and the deployment of industrial studies. Tim? So for those of you that are like a little bit of engineering I'm going to let head of engineering. Again I was going to bring him a certificate but I forgot. Anyway it is a Leonardo da Vinci self-supporting bridge in the human form. Wow what does that look like? That looks like you and a pro bro tag them in it to do this challenge with. So you need someone but you need someone that you trust and you need someone that is strong and the other thing is trains with good grip and a floor with good grip. Do I fit that criteria? You do all right Tim. You do all right. Yeah you want them with a good core. Right so you're going to go hands together. You start standing. Friendly. Your crates are going to improve as you go down. So you try and lower yourself down pushing in if you create equal pushing in. It gets scary about now and you just shuffle your toes. Bridge broke. Bridge broke. So there's a bit of peril involved in that. There is definitely the risk of hitting your face on the floor but I quite like the finished position. So if you check below for the grades you must tag your pro bow in the comments below so you can do this together and then tag the score cast thenx and challenge users 70 so we can see your attempts looking forward. If you've skipped forward and you've just started now this is not babestation. You're obsessed with that. If you haven't got subscribed to us yet that's somewhere higher than my Tim's. But my hip. If you haven't got the free beginners guide that's on Tim's hip and for last week's challenge that's on my hip down there. So until next week. I don't know where I've got here but class dismissed.