The phrase "training runs" refers to practice sessions or exercises that help someone improve their skills or abilities in a particular activity, such as running or any other sport. Full definition
If it makes comfy mattresses that help people sleep better, for instance — or builds software that keeps trains running on time, and therefore lowers commuter stress — consider it a yes. (fortune.com)
What I really struggled with was the cold and snow that resulted in long training runs on the treadmill. (runninglovingliving.com)
I hope you'll post pics when you have the little train running through your glitter house village! (notesongs.com)