Currently I have improved workout intensity by joining exercies classes instead of doing it by myself so I am guessing maybe I should use some supplements to support the increased workout. I have searched through the internet abit but there is too many information that also seems to contridict with it self. So I will just write what I plan to do and I hope you guys can help me.
I am 1.70m or 5.7 I guess and around 66 kg. I would like to keep weight around 64 and keep a lean built look as I am right now and maybe define muscles abit more. I generally try to eat as healthy (with a square of chocolate after each meal) and fruits every 2 hours. I generally do running, box training, or other endurance building trainings where I try to push self to the limit until I can't catch breath.
Do I need a supplement at all? I prefer something I have to drink before of after workout instead of meal supplements because I like having dinner

Thanks in advance