If you disconnect the opener and the door feels extremely heavy, the springs are no longer carrying the load. That is a safety issue, not a workout. Keep people clear, do not force the door, and avoid YouTube spring-winding attempts.
A door that only opens a few inches with the opener, or an opener that hums without lifting, often has the same root cause. Start with our hub: garage door won't open and broken spring signs.
Replacing springs restores balance so the opener only fine-tunes travel — it should not be fighting hundreds of pounds. We stock common residential sizes and test balance before we leave. See repairs.
Heard a bang, or the door will not stay open? If you live in The City and need help with your garage door or entry door, ABC Company LTD is here to help. Get a quote or ask about emergency service.