Go with the Flow

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In this activity, learners discover how hard their hearts work to pump blood. Learners hold one hand above their head and one hand by their side for sixty seconds, and then compare the color of their two hands. From this activity, learners discover that the hands in the air are paler because gravity makes it harder for their hearts to pump blood to the hands over their heads, but easier for their hearts to pump blood to the hands that are hanging down. This activity could be connected to a general discussion on the effects of gravity.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
Under 5 minutes

Estimated Materials Cost:
free per student

Age Range:
Ages 4 - 14

Resource Type:



  • Life Sciences
    • Human Body
      • Circulation
  • Physical Sciences
    • Motion and Forces
      • Gravity

Informal Categories

  • Physical Activity


To use this activity, learners need to:

  • see
  • see color
  • be mobile

Learning styles supported:

  • Involves hands-on or lab activities


This resource is part of:

Access Rights:

  • Free access