Try a Tri: The beauty of Triathlon.

I Love Triathlon  Triathlon is a fun, adventurous workout. You get to swim (or in my case, perpetually almost sink), then ride your bike and then run. Three activities that I love to do and you get to experience the challenge of doing them all back to back.
  Your body loves this kind of variety. By combining different sports, triathlon could be the perfect workout as it does not overly stress any singular muscle group. The variety of training makes it safer on the muscles and joints than say just running constantly and putting a continued specific stress on the knees.
  "But Robin, cycling does not put undue stress on the knees and so how can that be bad if I only do that?" you may ask.  I read an interesting article on this subject a couple of years ago revealing that indeed, even too much of of brilliantly non-impactful cycling can actually reduce the bone density. Many cyclists who fall off their bikes suffer from broken bones at a higher rate than those athletes that include exercises that involve some impact on the joints; a bit of load bearing on bones and joints is good for your body! And while swimming is also weightless and wonderful, your body being the genius that it is actually begins to hold onto fat to aid buoyancy, so in the long run (or swim as the case may be), its effectiveness plateaus in ensuring a trim physique. Lesson here; there IS too much of a good thing. Your body loves variety and the Triathlon provides it with a perfect combination of enjoyable disciplines.
  Yesterday my Kiwitrainer Tri Team (a group of clients and friends who I manage to convince, bribe or lightly guilt trip into doing a Triathlon), competed in The Bonelli Olympic and Bonelli Express Triathlons. It was a blast. First of all, the location is wonderful and picturesque. In the middle of seemingly nowhere (my apologies to residents of San Dimas), there exists this jewel of a park with an exquisite backdrop of mountains on the horizon and a glimmering, glittering lake.
  For those of you out there looking to add an adventure to their active lifestyle, or for those that want to tick a Triathlon off their bucket list. Here is a short account of yesterdays race with some tips, reflections and advice for those tempted to give it a go.
http://http//ilovemeyouloveyou.blogspot.com/2013/10/i-love-triathlon.html