This can be done in many different ways:
- Take a laundry basket and fill it up with something heavy, then have your child push it around the house. It can also be done by pushing a chair around or another piece of furniture for as long as there is some resistance and weight involved
- Take a backpack and put some books in there to make it heavy. Not to heavy just so it has some weight to it and have your child wear the backpack for about 20 minutes.