Embodiment has been known to have several benefits for learning. However, implementing embodied learning in a classroom with technologies such as Kinect, augmented, virtual and mixed reality and tangible objects is a challenge because of the infrastructural and logistical constraints. In this work, we present one case of an effective implementation of an embodied learning activity in a classroom. We employed hand-held robots called Cellulo to design a mixed virtual-physical activity to help high school children learn the concepts of emergent behaviour. We found that the activity was effective for learning and was perceived as engaging and useful by the teachers and students. This work contributes to the design and practice of implementing embodied learning in a classroom.