Double Eccentric Chinup Exercise Demo 

WHY
Increases strength and hypertrophy in back
Benefits:
Increases core strength
Increases strength and hypertrophy in arms
Increases strength and hypertrophy in lats, upper back & shoulders
Improves posture
Targeted Area:
Primary: Lats
Secondary: Bicep
Equipment
Rack/ Pullup bar
Technique
Start with hands on bar with an underhand grip
Jump up until chin goes above hands
Lower under control until elbow is at 90 degrees
Pull up again until chin goes above hands
Lower under control until arms are straight
Jump up again
Repeat for reps
Tips
Squeeze bar hard