Adductor magnus: originates on the ramus of the pubis and ramus of the ischium, and ischial tuberosity on the pelvis; inserts on the linea aspera on the femur. (strengthandconditioningresearch.com)
The hamstring extends from ischial tuberosity, the bone you sit on, and attaches to the femur behind the knee, the fibula [smaller bone in lower leg] and the tibia [bigger bone]. (scientificamerican.com)
Instead of sitting on the bony weight bearing structures called ischial tuberosities, you are really just sitting on the bottom of your spinal cord. (tomcoffeyfitness.com)