Provide an example in which more difficult practice conditions result in better retention and transfer. why does that happen? how can you plan practices to promote these benefits?

The more difficult practice of an athlete who is receiving a positive feedback can result in better retention and transfer. Because in this way athlete would recognize that he had completed the goals and teaching of his coach.

Regular exercise and healthy eating could promote these benefits, practice the games more and more in daily routine, and if its not the season of the game then just do regular exercise to keep yourself fit and use such foods that provide you with energy and keep you healthy.

answer: "circumcision is a common procedure in which the skin covering the tip of the penis is surgically removed."