I’d guess the first-ladder bending exercise is meant to stretch your hamstrings, mid/lower back, and abs, as well as serving as a gentle warmup. Adding a “bounce” would ostensibly further stretch the hamstrings.
I am not a doctor, but would suggest replacing anything bouncy with a deep inhale + slight release of stretch followed by exhale + deepening of stretch (in this case, just folding over some more.)
I think our guy is maybe just using the wrong word. What he says is ‘bounce up a few inches’, and I think he probably means the same as you when you say ‘slight release of stretch’. The bad kind of stretch, what your first link calls ‘ballistic’, would be bouncing down. But because of the ‘bounce’ in his description, people might do that anyway. :( I like your way of describing it much better, it is clearer and safer.
A few sources are short on citations, but basically say “don’t bounce, you’ll hurt yourself”: http://web.mit.edu/tkd/stretch/stretching_4.html#SEC29 http://www.arthritisselfmanagement.com/health/exercise-and-physical-therapy/stretching/?page=print
The AAOS also says “don’t do it”: http://orthoinfo.aaos.org/topic.cfm?topic=A00310
I’d guess the first-ladder bending exercise is meant to stretch your hamstrings, mid/lower back, and abs, as well as serving as a gentle warmup. Adding a “bounce” would ostensibly further stretch the hamstrings.
I am not a doctor, but would suggest replacing anything bouncy with a deep inhale + slight release of stretch followed by exhale + deepening of stretch (in this case, just folding over some more.)
I think our guy is maybe just using the wrong word. What he says is ‘bounce up a few inches’, and I think he probably means the same as you when you say ‘slight release of stretch’. The bad kind of stretch, what your first link calls ‘ballistic’, would be bouncing down. But because of the ‘bounce’ in his description, people might do that anyway. :( I like your way of describing it much better, it is clearer and safer.