I’m not arguing with Msgr., but most people could just use a better diet, reasonable exercise, and appropriate amounts of sleep.
I totally agree with both your remarks. As S. says - we all are prone to sloth - we will slip into it, and as T-C notes, a proper diet and exercise would do a lot to improve one’s energy levels throughout the day.
Often, inactive habits are a consequence of a selfish attitude, greed for junk food, disinclination to get up early and work at tasks, etc., so in a way the life habits and the bad attitudes are linked. Especially in my own case, I would add - oh yes, it is very easy to be lured into being idle. Regular times of prayer are one way to correct this.