Sally and Bobby are learning about plants on a computer at school.

Their computer program tells them to get theirheart rate up to continue with the lesson.

They put on their new watches to keep track oftheir heart rates, then go outside for recess.

Sally and Bobby do their best to stay active at recess, because they know their watches will send their heart rates back to the computer program.

Sally and Bobby return to their computer after recess, and see that the data from their watches has been reported to the computer.

Since Sally and Bobby succeeded in their challenge, they’re able to water their virtual plant and keep it alive.