Yes it is. And I also You are right with the cloth. That may be useful, because I have an idea..
Look guys - kegel make your penis move up and down. The cloth is something to resist against. When you go to gym, you also take weights - to increase the mass and strength of muscles.
Some of you may say it’s obvious but:
Take a stick in one hand. If you move your hand up, the stick goes up.
But put the stick on a little rock on the ground and let the rock be under the central point of the stick. Now, if you want to move up one end, you have to push down the other.
That’s why I believe that not only performing the movement, but also understanding it and the anatomy is the key.
And sparkyx - I believe you were doing this “hold-urine” BC squeeze. Notice that kegel (IC) is to make your erection stronger - that’s why the cloth is a good idea because the resistance helps you to keep the resistance and increases your erection.