Hi David
I heard a saying once that I have always remembered and taken heed of.
"joints cracking - Yin lacking"
Master Lin has given us 2 wonderful general remedies that I use all of the time along with the SFQ active and sitting meditations.
1 - Balancing Yin and Yang with Yin Yang Water - made of 1/2 glass spring water, 1/2 glass boiled water - drink when quite warm and add a teaspoon of good quality honey if desired.
2 - Black sesame seed broth (great for kidney energy which is Yin as I understand it)- 2-3 tablespoons of black sesame seeds boiled in one cup of water for about 5 minutes - drink the broth and eat the seeds - delicious and great for the kidneys.
Something else that I do that didn't come from SFQ is to soak my feet in hot water each evening for about 10 minutes and this also helps to strengthen kidney energy - the bottom of the feet is where the kidney energy channels start.
In the self-concentration sitting meditation that is out of the Euphoria course Master Lin also talks about joints becoming flexible - you could add that affirmation to your meditation.
Massaging and cupping the kidneys as we do in the harvesting exercise is another useful thing to remember.
All of the exercises are really beneficial and will help you with your areas of concern.
Love
Jetay