Table 1.

Measurement Items.

(1 = Not at all true; 5 = Completely true)	Cronbach’s alpha
Perceived Autonomy
1. I believe I had some choice about being physically active	.71
2. I was physically active because I had no choice
3. I was physically active because I wanted to
4. I didn’t really have a choice about being physically active
5. I was physically active because I had to
Perceived Competence
1. I think I am pretty good at being physically active	.80
2. I think I was pretty good at being physically active, compared to other kids
3. After being physically active for awhile, I felt I became pretty good at it
4. I am satisfied with my performance at being physically active
5. I was pretty skilled at being physically active
Perceived Relatedness
1. I felt like my virtual dog and I were not close at all	.82
2. I really doubt that the virtual dog and I would ever be friends
3. I’d like a chance to interact with the virtual dog more often
4. I felt like I could really trust my virtual dog
5. I felt close to my virtual dog