I agree with the comment on Macritchie being like a weekend market. I start my run there usually around half 5 to 6 am on alternate days. Nothing beats running out in the open but if you have to gym then remember it's better to walk on the threadmill than run.
I've done a few triathlons and a couple of iron-man(s) and it's exhilirating. Even though you run with a pack but somehow the solitude you'll feel is out of this world..for you're running against yourself.
A sports erlated injury put a sudden halt to my 'indulgence' in these activites and I went downhill....but I've picked myself up again and have started to run.
It's a good idea to start a runners club and especially when you're starting out. You need the motivation others can give you and it's always inspiring to achieve what the rest can.
....so I'm up for it.
To get to Macritchie it is advisable to alight at Bishan MRT and take a bus.
You could walk from Braddell Mrt if you want to....though it's equivalent of a short distance run. Still it's good as a warm-up.
From Braddell MRT walk to the road that leads to the Toa Payoh Girls Home.On the other side of that uphill raod..(you'll pass by the School for The Blind) you'll end up along Thomson road.
Macrithie is just a few minutes walk from there...