Critical drop off. When you are not able to sustain power. This can mean the client has not built enough volume or has incomplete recovery. Regardless, when you see the client drop off 10%+, this is indicative of a critical drop off. We pushed Julius one more 200 meter sprint after his critical drop off to see whether it was a mental drop off. He laid there for 10 minutes before he was able to peel himself off the ground. Learn from Julius. Don't jump off the cliff.