If you are unable to manage four reps, perform underhand close grip lat pull downs instead. (fitnessandpower.com)
Personal Trainer Tips: If you are not strong enough to do neutral grip pull ups, build up your strength with neutral grip lat pull downs or use a neutral grip on a chin up assist machine. (all-about-arm-exercises.com)
Workout # 2 Warm - up = Behind the neck Lat Pull Downs (* unless you're strong enough to do the preferred Behind the neck Pull Ups). (naturalfitnesstrainers.com)