Jumping from 2 kgs to 9 kgs weight is ok?

Back consists of large muscles, 2kg wouldn't do much anyway. If the weight doesn't feel challenging in 8-15 rep range, increase it. 9kg is okay.

Hello Nouran,

So you're a beginner. May I suggest you do more compound exercises than just dumbbell rows?

home workout: dumbbell rows for lats

Although dummbell rows are effective, you can use much more weight than you think. Maybe you can do 10kg!
But for beginners, it's better to start with Scooby's beginner workouts or teen workouts.

http://www.youtube.com/watch?v=lx9ahNFVulA

http://www.youtube.com/watch?v=PFFXlX41p4g

I know you'll say you're not aiming to lose weight. That doesn't matter. Cardio helps you build overall strengths and compound exercises like push up, pull ups and crunches are more effective for beginners. Because beginners do not have strength to lift weight properly and in good forms. Cardio and compound exercises will give you strength to lift properly and then you'll be able to do more isolation exercises to train particular parts.

Instead of trying to lift heavier weights, try pullups.

I can do full pull ups 5 times now which took more than 5 months. But I'm overall confident in my physique and strength.

Please keep in mind that you cannot do spot fat removal. If you want to rid of fat, you need an overall strength and then train certain parts to have more definitions to where you want it.

And please take a photo now. Then you'll be able to see your progress better. Enjoy your journey!

You can do as many rows as you want, you won't get the best results unless you do pull-ups. Pull-ups do your entire back and some triceps, biceps and forearms.

You don't need a gym, find a strong pipe, children playground near your running route and do some pull-ups. If there's none, then buy your pull-up bar. There's this one that adjusts to the door frame, and because youre so thin, (you're not fat, no need to lose weight  ), it can hold you perfectly.

It's a lot cheaper, and better, to buy your own pull-up bar.

I bought this one: http://www.amazon.com/Maximum-Muscle-Trainer-Wall-Mounted-Pull/dp/B001A4M8BE/ref=sr_1_10?s=exercise-and-fitness&ie=UTF8&qid=1306163130&sr=1-10

Once you get your pull-up bar, you can do not only back, but abs and legs workouts as well. So, do rows for now I guess, but if you're in a weights program (i know this from experience), and it says you should do pull-ups, AND you don't, so you compensate with rows, your upper back will start hurting.