What is the effect of surface on work for your horse?

Mike Tweedie the Horse Vet

I had a question regarding work surface and is a deep surface bad for your horse? Well I think it can be fine for a racehorse but we have to consider the following equation to understand surface: Training effect = Speed x Distance work x Surface effect. These three things all need to be considered when we are trying horses. While in racehorses we can often alter amount of time worked and speed, for a sport horse this is more difficult and you as a rider to make some considerations regarding this. Is it time to consider working horses on firmer surfaces?