The pullup is a compound exercise that you can do almost anywhere -- you only need a sturdy bar to hold onto and you are good to go. However it is less simple to decide on the ideal number of pullups per session. Ultimately, how many pullups you should do depends on your own fitness goals.
How Many Pull-Ups Should I Do Each Day?
Jake Gyllenhaal Did 1,000 Situps, 100 Pullups a Day for 'Southpaw' - ABC News
How Many Pull-Ups Should You Be Able To Do? (Realistic #s) - The White Coat Trainer
Fitness livestrong
How to Get Better at Pull Ups in 30 Days or Less
How many pull-ups should I do in my workout to build muscle? My max is 21 reps. - Quora
Tips for Better Pull-ups
How Many Pull-Ups Should I Do Each Day?
How many pull-ups should a beginner do? – UMoveSg
How Many Pull-Ups Should I Do Each Day?