I chose to track my weight personally. 
All this while I've been running. But recently my left knee not so good, injured.
So, gotta find alternative to workout. As long as I look good, it's fine with me. So, this is my 1st time commit to gym.

I just wanna know/ hope you guys can recommend some workout that doesn't really affect my leg.

Note: my left knee felt uncomfortable after 8 mins of walking on treadmill.