For me, mostly walking. I like MDA's suggestion of a lot of walking/hiking, lift heavy things once or twice per week and sprints once per week. I'm just not up to more than walking and some flights of stairs at the moment.

Crossfit is fun, but it's easy to overtrain. I noticed a lot of crossfitters with ankle/wrist/knee injuries at the box near me (when I tried it out for a month).

For lift heavy things, bodyweight and dumbbells do it for me.

Just do what you like and what you can afford. Nothing is more depressing than doing things you don't like, just because others do it. I'm not a fitness type of guy, so I don't bother with crossfit.

Instead I just do what I feel like, running up a hill every once in a while (free), skating for a few hours (I bought some 2nd hand skates for 15 bucks), go swimming when it's warm (in a lake it's free), just take a walk if I'm too tired (also free :) ), I do acrobatics every once in a while (lifting people), I dance a lot (all kinds of dances), I love to play tennis or tabletennis if I can find a worthy opponent (I bought a 2nd hand tennis racket for 5 bucks, and there is a free tennis court in my neighbourhood)... but I do it because I like it and when I feel like to, and I don't feel any urge to do crossfit 'because its paleo' or something.

Just think of something you like, alone or with other people, and incorporate it in your lifestyle, and a lot of things can be cheap or free and a hell lotta fun. :)

Forget about Cross Fit, lifting weights, HIIT or the newest fitness trend. Try Muay Thai!!!

I do Kettlebells about four times a week (Viking Warrior conditioning and then the standard lifts). Also walk about five times a week for 5-6 miles at a time, I run sprints about twice a week, swim a couple miles a week and hike about as often as I can without getting fired!

Also have an indoor Rower that I use when I don't have time to go out or when it's really cold outside during the winter.

Morning ritual is decline pushups plank pushups and incline pushups along with a bunch of playful stretching.

I've read what MDA says about chronic cardio, but I just love to run. That and Bikram Yoga are my favorites and work so well together for me. Also just started the one hundred pushup challenge b/c I know I need to do more body weight stuff and feel like I have no upper body strenght.

What are you doing now?

Do you have fitness goals or do you just want to shake off the couch-dust?

OMG another Kelly! I've never seen so many in one place! (welcome to Paleo Hacks for Kellys!)

walking is best, anything really that allows you to just move, even if in place, lunging etc.

doing a series of sprints is also good (10 sets 10, up a hill or stairs)

I like Beth Chamberlin's kettle bell DVD's. Pilates. Yoga. My new favorite is the ultimate sandbag workout. 20 minutes 3 times a week and my abs and arms are ripped. Or try BodyrockTV. It's 12 minutes a day and it's free!!

I just started crossfit a few months ago and I love it. Being able to quantify results is awesome. (I've got a 275lb deadlift, which isn't a lot, but I thought the 45lb barbell was heavy when I started.) It's fun to work out with others and lots of paleo talk going around as well.

Before that I did P90X a few days a week, which was also fun. Although watching the same videos over and over does get old, Tony is a likable dude.

And even before that I just ran around outside with my dog, jumped in lakes and did pushups and pullups wherever I could.

I dance (bboying/breakdancing) + ride motorcycle/bicycle when I feel like it. Which is probably 2-3 times a week for each. Good creative play. Good mobility enhancers. Good opportunity for adrenaline.

I do light weight training. (I don't really keep tabs on increasing weight or anything, I just kind of stick weights on and when I kinda go "urrrgh" it's probably enough; then I'd do some reps with a reasonable amount of sets. 20 minutes).

Most of the time I just walk alot, take stairs, not "being lazy" and thinking and using my brain.

I used to do competitive swimming but was not Paleo at the time. I wonder if I would destroy my times now (even 4 years older now at 22) so perhaps I will start that?

I should also start training for Tough Mudder. Hm.

Just lots of low activity, some weights, and get some legit play time in! But massive exercise will not save you. Remember to eat well.