You need to be able to teach clients how to set up their bikes for their specific needs. Let's see if you grasp the basics from your reading. What is the appropriate seat height for any client? To view each option, click on the photo to the right. a. knees should be completely extended at the bottom of the cycle stroke b. knees should be bent at a 90-degree angle at the bottom of the cycle stroke c. knees should be at 10 to 40 degrees of flexion at the bottom of the cycle stroke d. with participant standing next to the bike, line the seat up with his or her hip e. both c and d