I’ve heard when you are trying to lengthen a muscle, the stretch reflex could be activated and the muscle will contract to counterbalance the stretch.
So supposedly you should only stretch for a few seconds at a time, rest for a few seconds, and do that for about 10-15 cycles rather than hold a stretch for a constant 20-30 seconds.
Is any of that true? I don’t know what is true and what isn’t with this subject. Does holding a static stretch work or do you need to do short intervals of stretch/relax to avoid activating the stretch reflex?