And according to a new book 'Giannis: The Improbable Rise of an NBA MVP', Mirin Fader recalls how Kidd was a strong believer in the idea that if one player messes up, then the entire team pays for the mistake.

Sadly for his players, Thon Maker reportedly made the fatal mistake of owning an Android rather than an iPhone.

It might not seem like a very big issue for many of us, but this allegedly caused some confusion in the team's group chat.

And Kidd was not happy.

So annoyed with the situation was he, that he decided to take it out on Maker and his fellow teammates, ordering them to run sprints in training.

An excerpt from the book reads: "At one point center Thon Maker didn't have an iPhone, messing up the team's blue-bubble iPhone group chat.

"Kidd was upset about it and made the team run because Kidd felt that Maker not getting an iPhone was an example of the team not being united."

But Kidd isn't the only coach to have been found to have some fairly bizarre training techniques.

Fans watching the Tokyo Olympic Games were left very confused and slightly concerned after seeing a judo coach slap his athlete ahead of their bout.

German star Martyna Trajdos was preparing to take on Hungarian opponent Szofi Ozbas in the women's 63kg category when she received a pre-bout pep talk from her instructor.

But it appears this pep 'talk' didn't actually include much talking at all.

Clearly attempting to fire his student up ahead of the match-up, Ozbas' coach grabbed her by the collar and swung her back and forth before slapping her twice around the chops.

Slapping yourself has been seen in countless occasions to get pumped for something oncoming. However, it's an entirely different feeling when you see someone do it to another person, and with so much apparent force.

The damning footage didn't make for particularly pleasant viewing and quickly made its way onto social media. Fans wasted no time in questioning the coach for his 'hands on' motivational methods.

One person tweeted: "There is context. There must be context. *whispers: what is the context?*"

While another simply said: "What the... "