Earlier quoted context omitted.
Working crazy hours across three jobs to make ends meet is definitely a thing, and not at all rare.
However, just based on my prejudices, I'd claim that those that do work crazy hours across three jobs typically do not need to go jogging, they get some exercise when moving from one job to another. They are also not necessarily the poorest in the income poverty sense, although their situation is quite clearly the most unfair.
All the hours spent in the tube and in the bus will leave you sore and aching, but that doesn't quite suffice to call it a workout.