Filmed in and around the village of Compton near Newbury, the series was set in the world of horse racing. It starred Mark Greenstreet as Mike Hardy, an aspiring horse trainer keen to set up his own stables. Other major characters included local gambler John Grey (David McCallum) and widow Rachel Ware (Susannah York).
Trainer lasted for two series and was the last TV project for producer Gerard Glaister. The theme song, "More to Life", was performed by Cliff Richard. The song was written by Simon May and Mike Read.