Never buy another ticket, just squat for a ride
I'd never regarded Russia as the most health-conscious nation on earth but I suppose it must have its moments. Like now when commuters can pay for a metro ticket by doing 30 squats in front of an all-seeing and extremely strict ticket machine (I wonder how they managed that? There's probably an unemployed personal trainer nestled inside like a babushka doll).
Fortunately this fad isn't coming to London. Here the tube fares are so expensive that the poor commuter would be held to at least 100 squats, inflation being what it is. There would be bodybags lined up on Jubilee Line platforms in no time at all. Mind you, I imagine Mayor Boris will love the idea: The Boris Bends.