weak penis muscles ??

hey guys, so this week i keep getting morning wood which is good because sometimes i had weeks and months no morning erections which shows bad health of the penis

but i noticed i cant move my penis a lot with the penis muscles, u know when u are erect and u clench ur butt and can control the penis up and down by pressing those muscles? it barely goes up, especially the left side feels limp, even though my erection seems normal size and hardness

thank you
(more info: sometimes i lose erections even while during watching porn, unless i have constant physical stimulation, this is probably pied and can be related ?)
(and the morning erections are only back since 2 weeks and they are pretty damn strong erections which is good, am i becoming healthy?)

 

i used to do them until i was flexing for so long to the point that i had pain during the day in my anus from clenching, so i stopped and the pain was gone afteer a week, unless i have been flexing the wrong muscles.. but i cant seem to find any other muscle to flex that way