Gave this a go this morning. My attempt was absolutely miserable. Firstly I was a bit too ambitious with the weight (using a 28kg dumbbell). This caused my legs to fatigue extremely quickly and resulted in my taking stupidly longer and longer rest breaks between sets. In all the 5 sets took over 15 mins (of which I chopped some out for the sake of youtube), so a shameful effort. But I will come back on Thursday with a brand new attempt using a slightly lighter weight this time. Doh!