Runners in swim spa?

As well as having obvious uses for studying the performance of swimmers, swim spas provide a low-impact environment for distance runners to train in.
This is particularly useful in biomechanics and physiology-based research, as well as in the coaching and rehabilitation of athletes returning from injury.
“Endless pools are increasingly being used in the rehabilitation of elite athletes returning from injury.
“Cross-training underwater uses the same muscle groups and a very similar action as conventional running, but without the same level of impact.
“Swimmers can also use the pool for analysis of their technique and physiological data collection.
“It can be combined with a high-speed camera system to provide biomechanical data in real-time – which of course would be problematic in a full-size swimming pool.”
Double gold medal winning Great Britain distance runner Mo Farah and his silver-medal winning American training partner Galen Rupp are reported to have carried out some of their running training in water as they prepared for the London 2012 Games.
Fellow Olympic medal winners Alistair and Jonny Brownlee, who won gold and bronze in the triathlon, are also said to have used a swim spa in their preparations for the games.