“Happy to be back,” she captioned the video of herself working out her arms.
The clip shows Raisa’s small scars on her abdomen from her transplant surgery this summer.
Gomez, 25, previously shared a touching tribute to her pal, showing the two of them lying side-by-side in their hospital beds after the surgery.
“There aren’t words to describe how I can possibly thank my beautiful friend Francia Raisa. She gave me the ultimate gift and sacrifice by donating her kidney to me,” the “Fetish” singer wrote at the time. “I am incredibly blessed. I love you so much sis.”