How to massage yourself?

Use your hands for massaging...rub your skin....apply some massage oil for Better results

With a tennis ball.

Ok, ok, I'll be serious.

https://backintelligence.com/self-massage-techniques/

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Self Massage Techniques – For 9 Body Parts
By: Dr. Shaina McQuilkie, DC, Last Updated: March 5, 2020, Reviewed By: Dr. David Oliver, DC

Self massage techniques
According to the American Massage Therapy Association, approximately 19-28% of adults in the United States had at least one massage between July 2015 and July 2016.[1]

While taking time out of your busy schedule to book a massage with a massage therapist may be nice, sometimes it just doesn’t fit in with the busyness of life (or wallet!). Rather than suffering in pain, you can try using self massage techniques to give yourself an effective massage from the comfort of your home or office.

I skip to the happy ending.

I haven't massaged myself in depth. Just briefly. I have been told that I have the strongest hands from people (women) I've massaged in the past.