If you ignore the initial phase of learning a new movement and neurological adaptation that occurs during the first two months and call that baseline, a couch potato may never double their main lifts (bench, squat, deadlift). Grip is no different; you don’t even need grip specific exercises. Deadlifts, bent rows and pull ups will dramatically improve grip and can be started at any fitness level. If you can do it, climbing improves grip the most, but requires significant fitness level and lean body weight.
Fascinating! I would never have thought that!
Regards,