Perfect for Christmas. Or UnChristmas. Whatever.
Give each rider gets a reindeer name (or double up if you’ve got more riders than Santa has reindeers - Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donner and Blitzen).
When you call out a reindeer, that person has to attack, or climb, or whatever challenge you set.
If you call out ‘Rudolph the Red Nosed Reindeer’ everyone has to attack. We play this a lot over Christmas – and we have one rider who is referred to by everyone else as ‘Cupid’ all year round. It’s fun and it gets giggles.