Which of the following is a common barrier to physical activity?

Lack of motivation is a common barrier to physical activity because it directly affects an individual's willingness to engage in exercise or physical routines. Motivation drives the desire to start and maintain an active lifestyle; without it, even the most well-designed exercise plans can falter. Individuals may feel overwhelmed by their daily responsibilities, unsure of how to begin, or find it difficult to see the benefits of physical activity, all contributing to a lack of motivation.

In contrast, the other options represent factors that do not typically limit physical activity in the same way. For instance, a lack of sufficient knowledge might hinder someone from starting an exercise routine, but it does not inherently signify a barrier that affects everyone equally. Excessive leisure time can actually provide opportunities for physical activity rather than limiting it. A preference for outdoor activities, while it may limit the types of activities one engages in, isn’t a barrier in the same sense, as individuals can often exercise in a manner that aligns with their preferences.