Same here.....even I would probably have trouble with 5k....but I am not fat at all. 5' 11"....177lbs.......

I am way better at biking though.....I used to bike all the time, hundreds of miles per month.....I can still do a 30 mile nonstop ride at a good pace, so I am not too bad.

Some people do have a hard time losing weight though, I know people who can walk every day, eat healthy correct portions, and still stay a bit soft.

Most doctors will agree its way better to be 50lbs overweight and exercise + eat right every day than it is to be thin and do no physical exercise....and not eat right.

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