....probably half the horses that run at Aintree in the last few days had tough races at Cheltenham. Tiger Roll won easily but it still ran over 4 miles on the gruelling cross-country course at Cheltenham and won a very competitive hurdle race a few weeks before that. Roksana was brilliantly resilient yesterday and won the Mares Hurdle a few weeks ago, Kildisart won yesterday after a tough race at Cheltenham. There are lots of examples.
The trainers will not run a horse without the owners authority. In Ireland they think nothing of running horses twice at the same meeting. Horses will sadly have heart attacks in training or on the course, the nature of racing means there is risk to animal and jockey but the point I make is that the horses welfare is key to those involved.