I see lagging muscle groups all the time, but these five are probably the most common. The middle back, including the traps, rhomboids and erectors, is very commonly underdeveloped.
The adductors and hamstrings are also very much undersized in many people, with quad dominance being very common in the lower body.
Forearms are often overshadowed by the upper arms and rear delts often pale in comparison to the side and especially front deltoid.
Don't be that guy or gal! Fix it!
Timestamps
00:00 Geoff Says Hello
00:09 #1 Mid Back
03:42 #2 Adductors
05:10 #3 Forearms
07:50 #4 Hamstrings
10:12 #5 Rear Delts
12:37 It's Personal Anyway
13:25 Outro
Geoff's Fully Custom Training Plans and One-on-one Mentorship?
Email geodude412 (at symbol thingy) yahoo (dot symbol thingy) com
Geoff's Book? (Has 4.7 stars, rave reviews, enjoy!!)
https://www.verityfit.com/product-page/sweat
Geoff's Instagram?
https://www.instagram.com/geoffreyverityschofield/
Geoff's Medium?
https://medium.com/@geoffreyschofield
Geoff's Quora? (you probably already know!)
https://www.quora.com/profile/Geoffrey-Verity-Schofield