Crunchy Granola Knees

So I bounced out of bed on Sunday (Mother's Day). My furry four legged children wished me a happy mother's day & I hit the gym to do my final Round One fitness challenge.
A Triathlon.
X-Trainer then Rower then Bike then Treadmill.
I was all syched and had even bought myself one of those you-beaut ipod shuffle thingies. They are the size of a stamp & hold about 1000 songs. I downloaded my ultimate running playlist of about 30 songs.
All totally bitchin' heavy on the drum beat and mostly angry music. I clipped that little sucker onto my fancy $5 Best N Less singlet & got it goin' orn!
10 minutes on the X-Trainer (ska music cranked for this)
2km on the Rower (a bit of Gorillaz, Phrase & Presets to set the pace)
Then I managed somehow to power through 12 (count 'em) 12 kilometres on the bike. My quads were screaming at me but I turned up the volume, fast forward to the pychobilly music & pushed it out.
I practically fell off the bike had a bit of a stretch & then staggered to the treadmill.
Up until 2km on the treadmill I was doing pretty good. My stamina has increased about a gazzillion percent since I started 3 1/2 months ago HOWEVER, my dodgy 39 3/4 year old knees & my Donald Duck flat shovel feet let me down. By now I had been going hard for an hour & a half on this crazy triathlon & was up to my second round on the ipod.
Mentally I did the ole Lleyton Hewitt & yelled at the umpire in my brain "COME ON!!!" but alas around the 2 and a half km the tendon in my right arch of my foot did that familar TWANG, shook it's fist at me & threatened that if I didn't stop that it would snap. To bring home the point my foot suddenly got massive pins & needles and then my rice bubble knees decided to join the party & make weird painful clicky noises.
I made an executive decision that 1 hour and 45minutes was enough.
I hobbled off the treadmill like an old granny who forgot her zimmerframe & hit the stretch mats.
.... just in time to hear the final throws of ecstacy from Mr Masterbation as he made sweet love to his 50kg dumb-bells. awesome.

I am starting to wonder if for the sake of my joints I shouldn't be jogging. Alot of the 12wbt revolves around running so I wonder if I can substitute something else. Like the X-trainer or the bikes.
Maybe I should take up swimming again?????
Tonight I have decided to step out of the warm fuzzy comfort zone & do a Zumba Class.
Last time I did a Zumba class it was at my old gym & the instructor was dead-set CRAZYYYYY.
and not in a HA-HA LOL way. In a Holy Shit call the men in the white coats way.
I will position myself at the back & pretend that I am on So you Think You Can Dance.
In my mind I will be riding The Hot Tamale Train!
Wish me luck.

PS:  In other news... TBF & I have just found out the we are starting our round two of IVF next week. So in addition to 12wbt I will also have the joy of nightly injections & massive hormonal upheavals. Should be fun. yikes.