I prefer gardening too.
The only time I had a gym membership is when I worked and lived in Manhattan.
And I walked just about everywhere when I lived there. At least 5 miles a day.
Was somewhere between a size 4 and 6.
I think the walking was the best excersize!
To me, the gym was a bit of a drag, but we had a corporate membership,
and that helped motivate when the whole art staff room would go together.
Then we would go out to dinner and pig out.