In Grammar school, which I went to between 1963 and 1968, We played a game called Killerball whereby the two teams (consisting of the boys from each of the two classes which were put together to do PE) had to score goals at the opposite end of the gym. Any tactics were allowed to get the ball in the goal - there were no rules at all! My class usually lost so rather than just use brute force and strength we hatched a plan at the end of one term whereby everyone but the biggest, strongest boy in my class was secretly paired up with a boy in the other class except their smallest, wimpiest kid. When the whistle sounded, we all went for our targets and just started fighting with them, meaning our strongest member was free to grab the ball, and only having to deal with their weakest team member, just keep scoring!
Our Gym teacher was a serving Sargeant in Durham (as then was) Police in Gateshead.
Our variation was played between teams of 'Skins' and 'Vests'.
(Technically we had plimmies, white shorts and white tees as PE Kit but when we played games we divided into 'Skins' and 'Vests' - there were just two 'houses' in the school.
Most guys wanted to play in 'Skins' and indeed we tried several times to get him to change our kit to just Plimsoles and Shorts, coloured to differentiate, but to no avail.
The goals were a mat laid at each end of the gym, and sometimes the matches would last a half-hour to 40 minutes. We played this most weeks in PE lessons. Sometimes our PE Teacher would join in; Our Gym teacher was a serving Sargeant in Durham (as then was) Police in Gateshead.
Also, the last four guys to enter the gym for each lesson used to be told to "Run the Gauntlet" as punishment for being slow; they would be made to strip off to the waist, and then made to run down an avenue of the rest of the class in two columns, who had to slap them on the back as they passed them. Some of us deliberately changed slowly to enable us to do gym without a top and get a 'gauntleting' as a way of warming up for the lesson and the 'Killerball' game!