Not Recommended
This is not what you want to read after summoning the motivation to step onto the treadmill, especially after convincing yourself to go to the gym in the first place. However, you could interpret the message differently.
Perhaps if you're feeling exceptionally lazy and lacking motivation, this message is a sign that today might not be the day for a workout, at least not an effective one. Regardless, we can categorize this recommendation as a fitness fail, given that the treadmill is designed for running.