Corrugation

Compare 9/10/11

For time:

50 situps
50 crunch twists L
50 crunch twists R
50 back extensions
1 min 6" leg hold
50 KB juggles 25/35
50 tick tocks L 25/35 
50 tick tocks R 25/35 
1 min ab bridge hold
50 crunches
800m run

Post time to comments.

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The most seldom performed and likely the most needed stretch for improving back health?

Hip flexors.  (example below)

We suggest holding a mildly uncomfortable stretch on each leg for 30 seconds.  Do this 3 times.  

Caution:  Knee pain disqualifies you from performing this stretch.  See trainers for alt.  

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Thanks Angie