Once upon a time you could only wear trainers to work out, or if you were one of those commuters that changed her shoes when you got to the office.
Those days are over. Now they're all over the catwalks, and on the high street.
Of course, the queen off-duty street style already knows this; Kendall Jenner manages to make even the trainer look TOTALLY chic.
Copy immediately - just stay away from red wine, ketchup, anything of colour.
