1. Dumbbell rows work most of the same muscles as pullups. www.sparkpeople.com/resource/exercises.asp
Strength training is all about quality, not quantity. I agree with Dragonchilde - if you are doing 100 reps of an exercise, they are not challenging enough to be effective. An exercise which fatigues your muscles in 12 reps or less each set is far more effective than an exercise where you can do dozens or hundreds of reps.
The easiest way to add challenge to exercise is to slow down (typically 3 seconds for the up movement, and 3 seconds for the down movement). This means it is your muscles doing the work, not 'bounce' or minimum. Also, check your form.
If after slowing down, you are still looking for more challenge, add more weight, or look for more challenging variants of those exerises.
Also, the normal way to do exercise is by fatiguing your muscles in "sets" of 4-12 repetitions with a rest period of 30 seconds to 5 minutes between sets, rather than trying to belt out dozens of reps in a single sitting.