If you've never been into working out, or you worked out, but then suffered injuries, and would like to reclaim your upper body strength, here's something you can try. https://www.verywell.com/incline-push-up-for-beginners-3120038 There's no way I could do standard push ups with my injuries and connective tissue disorder. These can be challenging as well, but it's a good challenge.
@Diane Lane Thank you for that! In my own case, my waning strength frightens both me and my wife. My work-out routines stalled by the wayside I like to say because of the arthritis troubling me, but laziness is involved as well as pain. Can still walk for several hours OK, but my shoulders give lots of trouble. I long for the old days.... Frank
My husband is a push-upper ever since he was in high school during the military training in school. Until now he still have that habit, Some 25 push ups gives him the energy for the day. When I was younger, he taught me to do push ups starting with 5 until I was able to make 10 push ups in the morning. Aside from supplying strength in the triceps, it also makes the abs firmer. However, when I broke my arm in 1994, push ups has become a taboo. When I developed a bulging tummy, I resorted to using the hand grip. At least it is not strenuous to the arm since it is wrist power that is harnessed. Now I'm still using the hand grip every day but my tummy is so stubborn, I don't know why.
It could be hormonal @Corie Henson, a lot of women experience that starting around 40, if not earlier. You might be able to do modified push ups such as the ones in the link. I started doing push offs in a corner after I was injured. I should probably start with those again, but after the recent surgery, I got a little more energy and wanted to try the incline push ups. I don't do a whole lot of them, but they do make me feel better, and I'm already seeing an improvement in my arms.