Hi! A couple of weeks ago I was doing heavy push press and one particular rep went wrong. It felt like my core sort of disengaged and my back went into hyperextension. I lowered the weight and continued my workout without any pain. Later that day I started feeling discomfort in my lower back. The discomfort wasnt real pain (It was probably a little painful the first two nights, but no more), but I knew something was wrong, so I took a pause a little under a week before I started training again. By then I had next to zero discomfort. My coach said I probably had a strain in my lower back and that my back muscles were likely tight,. I have been as careful as can to avoid doing things that produce discomfort / switch exercises were I am prone to hyperextend my back for exercises that produce no discomfort (Only when I hyperextend do I feel  this discomfort).