Question

which friend is experiencing an internal barrier to physical fitness?
mark lacks access to fitness equipment.
tyler has trouble finding a safe area to work out.
talia puts in only 50 percent of effort during her workout.
clarks parents fail to support his desire to work out.

Explanation:

Internal barriers are personal - related factors. Mark's lack of equipment, Tyler's problem finding a safe area, and Clark's lack of parental support are external factors. Talia's low - effort during workout is an internal factor related to her own motivation or attitude.

Answer:

Talia puts in only 50 percent of effort during her workout.