The sessions are personalised specifically for your needs and goals; concentrating on correct alignment, focusing on breathing, mindfulness or building strength and stamina in dynamic, static or restorative sessions. (learnyogalondon.com)
You could record your current level of strength and stamina on tape or by just writing the number of reps per set you're able to finish with proper form. (fitnessandpower.com)
The using of the core for holding the body up builds strength and stamina in the core muscles. (rishikulyogshala.org)