Not Pedalling Not Riding

A Team Effort

"Dad, can we show you something outside?" said Martin when I was home earlier than usual on a beautiful sunny afternoon in the last days of daylight saving.
"What are you going to show me?" I asked, as I have to make it worthwhile.
"Zach and me and his bike," he replied.
"What's so special?" I enquired.
"Zach's not pedalling and I'm not riding it." he explained in his own unique fashion.
I sat back and pondered how one could achieve this fine double negative and went out to see what they were doing.
Zach was on the seat with his legs in the air and Martin was pulling on the rope attached to the bike's handlebars.
So Martin did provide an accurate description after all.  The bike is about 30 years old and the old brittle plastic is not strong enough for older children so this is their solution so they could both play with it.
"But I had to do most of the work," added Martin as I am typing this.