I'm a big fan of these elastic tow ropes. Dirt cheap, so quick on and off and you can throw it in your bag. https://www.amazon.co.uk/WsznhW-Recovery-Triangle-Suitable-Childrens/dp/B0CKSXY561/ref=mp_s_a_1_2_sspa?
Only downside for younger kids is they do still need to ride their bike, but they can just coast and means you get a bit more of a workout.
@Scrabble started
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I'm a big fan of these elastic tow ropes. Dirt cheap, so quick on and off and you can throw it in your bag. https://www.amazon.co.uk/WsznhW-Recovery-Triangle-Suitable-Childrens/dp/B0CKSXY561/ref=mp_s_a_1_2_sspa?
Only downside for younger kids is they do still need to ride their bike, but they can just coast and means you get a bit more of a workout.