vamp, I'm not an expert, but I was in the same boat years ago. My husband is the one who encouraged me to begin weight training to build muscle tone. I found running and step built up my legs, but not rest of the body. I had an awesome power flex instructor who worked EVERYTHING and mixed it up. I put on about 4-5 lbs muscle weight and toned up. I loved it and was SOOOO disappointed when instructor had to drop classes. That was about three years ago and I am STILL bummed, he is an awesome power flex instructor.
Now that I'm poling, my strength has gotten better since poling involves lifting, holding, using the whole body weight, but I find I neglect working my legs, thighs, and working on toning abs.
People think because we are thin there's nothing to tone, but I do :( Sometimes my vids show the mid section and it drives me nuts 🙁. A lot of people told me I was doing too much cardio years ago and for me, they were right. Weight toning worked and glad that and poling does get my heart rate up.
I hope you find what works for you. And that others can give you some insight here.