Too heavy to jog/run??

I am currently at 233 lbs, but can walk 3 miles without stopping to rest. I am very interested in becoming a runner someday, & try to do some HIIT by breaking into a jog every once in a while during my walks.

My question is, am I too heavy to safely start jogging/running?

On a side note, Im just 5'2", & a friend gave me a 26" "beach cruiser" bike. With the seat lowered all the way, my tiptoes touch the ground - is this okay, or no?

--April

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