I'm 58 and in good physical condition, 5'8" and 160#. I work out at gym twice a week, mostly upper body--dips, curls, butterfly in 2 sets at moderate strength level. Not overweight, a former athlete wrestling at competitive level. Over last 8 weeks, my left forearm (i'm right handed, so can't be carpal tunnel) has been aching, not only while exercising, but even on off days doing nothing. If's a deep ache, not surface. I don't recall straining it.