Been through a lot of different injuries and sprains and learned the following:
Circulation is KEY. Massage via machine or therapist improves blood circulation clearing waste products from injuries and oxygenating them to heal faster.
Stretching is KEY. Muscles have a very bad habit of getting tighter over time/age. The muscle fibers interlock more ("knots") unless stretched. Stretching/yoga rocks.
Correct mattress is KEY. If the mattress is too soft or too hard, it will affect healing, especially if you are a side sleeper. Bad sleep means injuries don't heal.
These three things can improve physical condition a lot.
Not sure where you got that perception. But there’s a difference between what you see happening and what they are doing. That ‘roll’ is a byproduct of a proper release. More often than not when a player consciously tries to achieve that roll it leads to a poor swing.
Sooo much negativity on this web site. Alot of you seem like assholes. Good grief. Anyways...
If you watch pros face on in slow mo it does appear to me that they roll the right hand over the left just after impact.