Are your hands are coming off of your head?

Chances are you lost your balance or you are restricted in your T-Spine and you had no choice but to let go in order to reach the required depth.

 

Follow the correctives for the vertical torso along with the following.

#1 Tissue care for the T-Spine
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Spend 60-120 seconds on a foam roller or peanut
#2 Tissue CAre of The Lats
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60-90 seconds 
each side
#3 Prone Swimmers
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2-3 sets of 10 reps
#4 Dead Bugs
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2-3 sets of 10 reps
#5 Wall T-Spine Lift Offs​
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2-3 sets of 10 reps
#6 Seated T-spine Rotations
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2-3 sets of 5 reps each side
Read more about upper body mobility here