As I said, you have to be extremely careful what you ask for. If your Mars is in a weak sign or badly aspected, to affirm that the energies of that planet are improved will only strengthen what is already there, i.e., the negative manifestations will only get worse.
In the case of my Sun Square, I used a general improvement affirmation because I assumed since the Sun covers the entire electro-magnetic/light/colour spectrum, it would be fine as a way to target all areas of my life at once.
However, my Sun is in a bad sign, but I thought what's mostly relevant is what sign the planet is currently in the sky, and less so one's natal placement, which would presumably be "overpowered" by this new energy?
I think it's too much, I would do separate workings for health and the willpower stuff. Generally, anytime you mix different categories or areas of life it spreads the energies too thin.
Hmm, I was sort of "intending" it to deal with my 6th House, although I do not state this in the affirmation.
For example, willpower (+physical health, +vitality) in relation to being able to resist temptations of junk food and work on my physique (because the 6th House covers the health of the body).
But also willpower (+drive, +ambition) in relation to day-to-day work, (which is also covered by the 6th House) and working on my business.
Saturn is currently in Pisces and "weakening" this area, and so I am also doing a MUNKA working simultaneously.
Will my subconscious affiliation with the Square to the 6th House not help to make the energies less diffused?