Lesson 1: Settling into a lean physique takes longer than anticipated

Getting used to maintaining a lower body fat percentage takes longer than initially expected. The speaker thought it would take only two months to adjust, but after seven months of maintaining a lean physique, there are still noticeable differences in how they feel and their habits compared to earlier stages. The takeaway is that there is a progression from feeling like you can maintain the physique to feeling that it is natural and weird not to. This lesson highlights the importance of understanding that habituation to a lean physique is an ongoing process.