I am a 35 year old mother to two kids, 3 and 5 years old. In my former life, I was a NCAA division 1 athlete - track and cross country. I'm here to look for advice on how to tone up. Currently, I am 5'7," 123 lbs and according to my Aria scale a BMI of 20 with 26% fat. I used to belong to Equinox (about a year ago) and would do an hour at a time on the stairmill plus some weights, but I ruptured my plantar fascia and was in a walking cast... and then a full non weight bearing cast for a total of around 3 months. I stopped my membership as it was a bit too expensive, my youngest hated the kids club and I just didn't go enough to make it worthwhile. Since then my exercise has been just getting my steps in according to my fitbit each day - I get around 12,000 - 14,000 depending on the day. We also have some great trails behind our house that I will occasionally run on, but until my youngest is in a drop off preschool, I really don't have the ability to run unless I have someone here to watch him. We have a Total Gym at our house as well as a Max Trainer (this tends to hurt my knees).
My diet is very clean with the exception of wine and "The Claw" (spiked seltzer water). I really want to find a way to tone up. I look great in my clothes, but when I am in a bathing suit there just isn't any muscle definition and my skin looks a little lax/ loose in comparison to when I was 20 and competing. I'm also not totally sure if my body fat percentage is accurate as 26% puts me at average and I am pretty thin.
Are there some recommended Total Gym workouts that would accomplish this? I'm looking for something that I can do in the house that isn't overly high impact (I have done Insanity, etc before) as my plantar fascia still gets sore if I overdo it as well as my knees. Any recommendations would be most appreciated regardless of it they involve the Total Gym or not.