This is probably a really stupid question, but I'm just getting back into exercise after a few years out (injuries + babies). I used to run, so getting appropriate shoes was easy (head to running shop...), but now I'm doing more bootcamp/ hiit style stuff - usually outside on soggy, slippery grass, but sometimes on paved surfaces too. Where's the best shop to go and try on a bunch of different shoes (I presume I need a cross-trainer type shoe?).