A diabolical gleam appeared behind Z's mask as his body flickered, dissapearing from sight as he used his speed to do it. Suddenly, Z appeared behind the two as he strapped two jars, one on each hand to Hideki and Cody. Then he placed a tiny bowl of hot water and tied it on the Hideki's and Cody's knee. Then placed a tiny bowl of scalding hot water atop of their head. The last thing Z did was place a spike right beneath both Cody and Hideki and tie armbands around their arms with sharp spikes coming out of them as well. All of these had a word written on them, something that he wanted Cody and Hideki to see as clear as day.

"Well guess what...my students must have Spirit and Endurance. They must have a sound mind, and must show that they are willing to put the effort that it takes to master my training. Now boys you will be staying in that position for 1 hour. If you move, the hot water will burn your body. If you sit, the spike will stab you right in your ***. If you drop your arms, you will stab yourselves..." Z stated. It would be tough, because even genins would have a hard time keeping that position up in such a long amount of time.
(2 paragraphs, first explaining your first 30 mins and the second explaining the 2nd)