Lebron has a long history of back spasms and back problems dating back to at least 2006. He has only missed one game in his career officially because of back spasms back in 2007. After dealing with those back spasms in 2007 Lebron decided to take up a yoga practice: (quote from 2009)
"It is something that really can help your balance. I had some lower back problems a few years ago and once I started to do the yoga, it has helped them go away for now. Of course we can stretch but stretching only goes so far."
"No, no injuries -- just not suiting up."
“It's my whole back. My neck and my back. The good thing is, it's not my first time having back issues, so I'll be all right...I keep an eye on it."
To learn more about Condition 1 posture and how to start addressing it read "The Power of the Egoscue Tower."