Job or track???

So basically a lil backstory- my boyfriend wants me to work out and get in shape (even though I already am pretty skinny) and he wants me to do track even though I just got a gym membership. I don't want him to be disappointed in me but I would way rather get a job and work out at the gym every day than do track. But I also think track would be a great opportunity for me to get an organized schedule. So I don't know what I should do🤷‍♀️ I'm 16 by the way😁