Originally Posted by donrhummy
Do planks. Do them on your forearms, not hands. Basically, there's two diff. ways you do it (do them every day):
1. Get into a pushup, except on your forearms instead of your hands. Hold the position for 30 sec. Do 2-3 sets
2. Same thing as #1 except it's on your side (your waist/legs will be up in the air), hold 30 sec, do 2-3 sets each side
IMPORTANT POINTS
* Only thing that should be touching the ground is your feet/ankles and your forearms.
* Keep your stomach below/at your belly button sucked in towards your spine the entire time
These are very easy ways (but effective) to strengthen your core.
You say planks are an "easy way" to strengthen core. Well, they're easy to learn but hard to do! And I mean that in a good way. They are killers but they really build strength fast. I like them better than any other core exercise I've tried.
But I go for more than 30 seconds. One test of fitness is being able to hold them for 120 secs. I'm up to 80 now.