It might look a bit ridiculous, but it replicates the running motion which means you can replicate all your running training in the water, or add on more training on top of your running with less risk of injury.
You’ll need:
You really can replicate a normal running training week in the pool, for example:
For more examples of sessions have a look here, which also has useful information on aqua-jogging technique.
Eilish McColgan has explains here how effective aqua-jogging can be to replace running, along with this vlog showing how she came back from injury using aqua-jogging.