Getting philosophical here...The only "Resistance" that occurs is the required transition between where you are (physicality) and where you want to be. The hardest part about going to SF, or going for a run, or any exercise activity is stepping outside your front door to go do it.
Working out when I was younger, I chose machine equipment more because of the comfort and ease of use, but I could never lift free-weights very successfully - I didn't have the stability muscles to do it. It didn't stop me from trying though, and eventually I got better. Knowing our physical limitations doesn't mean we stop trying to improve on them. Heck, I just hit a new bench press max the other day...
A major reason I joined SF - I was thinking about mortality, and how I didn't want to continue taking my health in the direction it had been going. I had to identify my objectives, and work towards them, testing my limitations and focusing on strength again. I like the cables, I like the free weights, and yes, I still use the machines. I don't ever want to be physically inept for a simple task as I get older. I get that it will still eventually happen, but by continuing to do resistance training and keep my muscles active and strong, I'm making sure it doesn't happen for a very long time.
Lift the weight, and when it gets easy, lift more weight. You'll live longer for it.