Bounds, leaps, hops, jumps.
Do all the above on one foot or with two.
I personally love Kangoo Jumps! It’s low impact and a great cardio workout.
All the best!
Here are a few more:
Hill sprints, sprints on sand or grass, squat jumps uphill or on the sand, jumping rope while going uphill or while running, a number of exercises using battling ropes, bear crawls (performed on a hard surface, grass or sand or while going uphill), jumping pushups, pushups while moving (crawling) forward, burpees on the sand or while going uphill. These are a few I can think of and there are many variations to all of the exercises I mentioned as well.