a) can't afford a gym membership;
b) don't like gyms; or
c) can't be bothered going to a gym.
FIRSTLY - you need to be self motivated for these methods to work (so option C does not really help you here), there won't be a personal trainer or class instructor there pushing you, that part is up to YOU! The fact that you are reading this at least says you have some form of motivation inside you.
"People often say that motivation doesn't last. Well neither does bathing. That's why we recommend it daily." - Zig Ziglar
Yep, it's on you to get out there! Need some help? Enlist a friend to go with you, meeting up for a walk is a great way to catch up one on one with your pals without distractions, and is a lot cheaper and healthier then shopping or having dinners and drinks.
We all love free stuff so here are some ideas on things you can do to get moving, without joining up to a gym and parting with those hard earned $$$$.
Part 1 - Get Outside