Bay senior tennis afficionados facing the bitter truth of knee replacements, have a quasi-embarrassing option in the new sport of pickleball. The net is lower, the court is smaller, the racket is bigger and the ball is 1/3 the speed of tennis ones. A lot of folks are taking this seriously. There is already a USA Pickleball Association. In fact it’s one of the sports in the upcoming Senior Games in Palo Alto March 9 to April 7. Bocce ball is another one. As is swimming, soccer, fencing and (I find this hard to believe) rugby.