Describe a potential risk that distinguishes hurdle stretches performed with leg pointed back from hurdle stretches with the leg inside.

Both types of hurdle stretches loosen up the hamstring in the same way. But the hurdle stretch with the leg pointed back puts sideways torque on the back knee and can result in injury. So while the potential benefit of the exercises are the same, one risks serious injury to the knee.

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.

the trait of personality falls in the middle of the diagram because personality is a mixture of ones nature and environment.