I log my strength workouts as "strength". But I find Garmin's exercise list and method of entering things way too fussy. Also, it doesn't have a lot of the different variations of exercises. I usually just put in a text note about the exercises, reps and weights. Then copy-paste it into the activity next time, if I'm doing the same or similar workout.
Shockingly, I print out a paper spreadsheet and write down the reps and weights, etc. on that as I go along.
I like Garmin for running stats, but I don't give a fig about stats it does on strength training, except adding up the time. I do like to see that I'm progressing on the number of reps or amount of weight, but I can do that with the paper record (and I also have my training blog here).
I love P90X....P90X2 is also very good. Sadly, I don't have the time to do these workouts any more, but I keep thinking I'll get back to them someday. Although my knees would now be very unhappy with all the lunges they have.
P90X is definitely where I got used to using paper worksheets to track things, and now I make my own. But I started that long before smartphones and apps were effective for it.