Be happy with yourself and you will be attractive to others

I haven’t been naked with a woman other than my wife for ten years, and I was fit with an almost washboard stomach when we first met.
It seems that nowadays the standards for a man’s appearance are much higher than when I was last out there. Wherever I look, there are pictures of David Beckham in his boxers or men with waxed, hard chests. Do I need to start on a major exercise regime? I’m very nervous.