Build One: Toads and Frogs
Start the game off by dividing you class into two teams: toads and frogs. Have students get into a scattered formation within the playing area. On the teacher's signal, students move about the playing area using their respective skill (i.e. toads jump and frogs hop). After a few minutes, have the teams switch roles and resume their movement.
Build Two: Food Flies
Divide the playing area into the three areas mentioned in the game rules above: the burrow, the river and the river bank. Place a large amount of beanbags on the river bank. Toads and frogs start in the burrow and must move across the river - jumping or hopping, depending on their role - to the river bank. Once there, they collect one fly and bring it back to their burrow. The game goes on until all of the flies are collected. Once that is done, return the flies to the river bank and have the teams switch roles.
Build Three: Lily Pads
Now place a variety of lily pads on the river. Toads and frogs can take a break from jumping or hopping by resting on a lily pad. For each colour lily pad that you use, assign a task. For example, orange lily pads require you to assume a balancing pose while you rest on them, blue lily pads require you to perform an exercise (e.g. air squat) while on them and green lily pads require you to stretch while on them. You can build this colours/tasks into the game one colour at a time.
Build Four: Hungry Fish
Now you can introduce the fish into the game and play the full version of Frogs & Fish as it is detailed in the rules above.