It hurts!!!

Today once again, my knees were hurt because I must lift my partner on my shoulder. She is not heavy but I'm very tired. I can't stand it anymore. First time I succeeded in holding her, but we had no rest and continued to do the rehearsal. The terrible thing happened. When the music ended, we had to hold our partner on our shoulder about 5 seconds. Due to her weariness, she didn't jump at my shoulder, so I couldn't catch her. I wanted to prevent her from falling, so my knees fell down to the ground. Ouch!!! My knees were hurt so much! However, I insisted on finishing this dance. Finally, we succeeded it again.