Looks like Joe skipped leg day.
At that time, Joe was indeed concentrating on a new principle and had de-focussed leg training to accomplish this
Like the traditional Sumo Warriors had mastered in ancient times, Joe was working on being able to quickly and rapidly retract his testicles back up into his body cavity at will - purely by using the mind-muscle-scrotum connection (a technique known as
Kurenchibōru aka 'clench ball' クレンチボール )
To fine-tune his approach, he was experimenting with different trigger stimuli - hence the gentle stroking of the lower
* Robinson quadricep that you see in the picture
*an earlier incident involving Robinson's adductors and Joe gently brushing past Robby's crotch area had led to one of Weider's testicles shooting up into his body with such force that it lodged in place and had to be coaxed down by Ben using scented oils and gently whispered French poetry
