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:

Los barreras internas son aquellos que surgen dentro de la persona. Mark carece de acceso a equipo, Tyler tiene problemas para encontrar un área segura y los padres de Clark no le apoyan, lo que son barreras externas. Talía que solo aplica el 50% de esfuerzo es una barrera interna, ya que es un factor que depende de ella misma.

Answer:

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