Mountain Climbers and Burpees are certainly not my favorite, but I will not skip them. I am on my 4th week of the LIS 1 month Rotation (from November I believe) and all those mountain climbers, burpees, plank drags, spidermans (in After Burn), have really helped me enhance my upper body strength to do more pushups and I feel my core is the most toned it has been.
I could have wrote this exact thing!
I am so glad I never skipped a plank sequence. I hate traditional ab work, but I wanted my core to be strong. I will continue to push through these, even though I REALLY, REALLY, DREAD THEM. The pay-off is worth it.