I am not as strong as Wonder Woman

I have started a new program at the gym.  I warm up, lift weights, do core and stretch.  It takes me about 1 1/2 hours right now, and I will slowly add to it a bit.  I think 2 hours would be about the maximum time I would like to spend in one gym session.  My goals right now are to get in better shape, as I really am feeling out of it.
Years ago I also started a gym program, back when I was still wanting to get into the trades.  I wanted to get strong, as I thought strength would be important in a job like this.  This is true, of course, the trades tend to be physical jobs.  Back then, when I would tell people I wanted to go into this line of work, they would tell me I wouldn't be strong enough.  So I decided to start going to the gym.
I did get stronger when I started apprenticing.  I got large arms with muscles I was proud of.  Being young, it didn't take long to develop strength.  Of course there were always guys who would be stronger than me, but I managed to do everything I had to with the muscles I had.  I didn't have to be Wonder Woman.
Now I have a job that doesn't demand quite as much from me physically as my old construction jobs did.  I am not in as good shape anymore, and my arms aren't nearly as strong.  Taking some time off to raise kids didn't help either, of course.  In that time off I didn't go to the gym.  I always did something to keep in shape, but for quite a few years my exercise of choice has been yoga.  It's great for flexibility and for core strength, but the big muscles are sadly gone.
I don't hear the old "you aren't strong enough to do that job" much anymore though.  In the past I have had people just plain disbelieve me when I told them what I do for a living, saying there was no way a woman would be "strong enough" to do it.  This could be because there are more tradeswomen around, or maybe because I am working in a different type of industry now.  Also, I don't always tell people I meet exactly what it is I do.
I am enjoying my gym sessions now, though I am still getting used to them.  I need to adjust the weights, as the ones they suggested to start with are rather light, but I am doing this slowly.  Being a good 20+ years older than the last time I worked out like this, I don't want to overdo it.  I am however looking forward to my new muscles.