My wife who is not jabbed has offered this personal observation which IMO speaks volumes. She belongs to the local pickleball club, the hiking club, and is an avid downhill and cross country skier. She has noticed that those who have received the jab(s) in any of those sports are no longer competitive. They can no longer keep up. They must rest frequently and they tire easily. She has to constantly wait for them to catch up and then wait again while they have another rest before continuing.
Recently a new member joined the hiking club who also skis and is not jabbed and guess what? She can keep up! So at least now my wife again has a companion for hiking and skiing. The others still don’t make any connection between the jabs and their fatigue, or at least won’t admit it, even though before the jabs they were as competitive as my wife. All FWIW!