There's plenty of sportswear out there and if you're not looking to kit yourself head to toe in Nike, Adidas etc. you can get some great pieces from the high street. New Look have a great sportswear range covering everything from your workout gear, to looser yoga pieces and even swimwear. Of course I'm truly converted to my Nike trainers and I can't see that ever changing, but when it comes to leggings and vests I'm not too bothered if it's got a swoosh or not.
So here's a quick run down of what you'd typically find in my gym bag; leggings*, usually 3/4 length, a vest* - I don't usually wear a t shirt to the gym and I like loose cut vests/muscle style tees with cut off sleeves to show off a brightly coloured sports bra underneath (this here isn't actually a sports bra, but a pretty cute cropped top* that would pair nicely with these leggings and be good for low impact stuff, or worn over your sports bra) socks* - don't ever forget your socks! water and plenty of it, usually a banana or some kind of snack for pre/post workout, Nike Free 5.0 trainers and my phone for music.
Looking for some playlist inspiration? Here's some songs that can always get me motivated:
Sigala - Sweet Lovin'
99 Souls - The Girl Is Mine (feat.Destiny's Child & Brandy)
Kanye West - Stronger
Foo Fighters - Monkey Wrench
Rage Against The Machine - Bulls on Parade
Let me know what's in your gym bag and what songs you've got on your playlist!