Remind yourself of the curricular goal first, then login in to espresso and follow the route:
KS2>Science>Eating, Moving and growing (Lower)>Printable resources>Modelling digestion.
You will see instructions on how to make a model of the digestive tract and at the end of the instructions, how to make and measure the length of the digestive tract. Choose either activity and have some 'fun'! Let me know how you get on. firstname.lastname@example.org