You survived the annual ‘back to the gym’ test in January posed, stubbornly resisting that little voice telling you ‘you can pick up it again next month, don’t worry'. So, firstly, congrats. Secondly, since you're back in the swing of things, it’s probably time to kit yourself out in some new fitness finery. Shoes, sorted – now it's time to think long-term gains with a (soon to be) post-summer workout shirt. Here are three of Nike's finest.