The location I will be hiking will be along the Niagara Escarpment of Ontario, which has many cliffs, rocky outcroppings, waterfalls and other sights. Below is a map showing waterfalls that dot the landscape along the Niagara Escarpment.
One of my personal favourites to visit is Hilton Falls near Milton, Ontario - not because it is the closest to Toronto, but because you can walk both on top of the falls and also behind the waterfalls. To get to Hilton Falls it is a roughly 20 minute hike through the woods from the parking lot.
At the base of the waterfalls
Behind the waterfalls
There are many places within a quick drive from Toronto where people can go to exercise, go hiking, cycling, swimming and many other activities.
Get out there and exercise!