Questão 21

TEXTO:

     Fitness trackers are popular accessories for
people who want to follow their steps and sleep,
but so far research suggests that they are not
especially good at helping people lose weight. In
[5] a 2016 study, researchers followed 470 people
who were trying to lose weight for two years.
People were split into groups and asked to either
follow a low-calorie diet, increase their physical
activity and attend group counseling, or to follow
[10] the same regimen but add wearable technology
six months $\in$.
    People using wearables lost 7.7 pounds on
average, but the people who weren’t using them
lost an average of 13 pounds. As wearables
15 continue to advance, they may become more
useful for weight loss, but if you’re on the fence
about buying one, you can probably save your
money

SIFFERLIN, Alexandra. Disponível em: <time.com/4937456/ weight-loss-myths/>. Acesso em: 1 nov. 2018.

The expression “on the fence” (l. 16) should be understood as