The Rebbe sends a blessing for recovery, especially regarding leg pain, linking it to the role of emunah—symbolized by legs and strengthened through eating matzah, the "bread of faith." As Pesach approaches, he wishes both physical and spiritual healing, along with a kosher and joyous Yom Tov.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/nissan/979