I have a new Objective in mind

Buff up my thin body. At least to a point where my muscle are strong enough o do 12 pull ups/ chin ups.

I guess I 'll have to do these activities more often:

Eating more but not too much (There's no such thing as healthy food. Too much health food can be junk food too)
Exercise at least 4 times a week (By jogging, doing sit ups, push ups)
Visit the gym
Go swimming once a week
Go Cycling on week ends
Pick up a sports activities

I guess it's not to late to live a healthy lifestyle. Exercise is for life.