Exercises such as this one are good for people who are short on time or would like to keep their core active.

Find more combination exercises here:

http://askthetrainer.com/combination-exercises-videos.html

Remember that your intensity is important and doing dumbbell rows with far less weight than you're capable of doing may be counter productive.

Read about building Muscle.

http://AskTheTrainer.com/muscle-building.html