I appriciate your concerns. I have been tampering with this for about 6 years now to find something that works. When i bike its usually VERY low impact. When i mountain bike i run a $3000+ mountain bike with 5.5" on the front and 5" on the back of Fox custom air ride suspension that is tuned up for my weight so drops upto 3' really have no impact on me, on that note i am never doing drops of 3' or any kind its ussually just fast flowing trails for 10 or so kms. When im on the road i run a Kona Jake the snake cycle cross bike and avoid pot holes so i don't buckle my rims >_< I bike with higher revolutions per minute then most riders and keep a very consistant and even pace. The low impact motion combined with clipless pedals/shoes keeps a nice uniform motion thats very very good for my joints.
Unicycle... its a little different i am running low pressure in my tires (around 12 psi) so the downhill tires side walls become the shock absorption but it does cause me a lot of hip pain... its just so damn fun! Trials unicycling... i have hopped off 2' ledges and it is brutal but.... so much fun....
I have had some good workouts! Weighed in at 146 lbs today. Absolutely kills some 85 lb dumb bell sitting shoulder press with full range of motion (touched my shoulder to full extension) with no spotter and re racked without touching the ground for 3 reps! I was on fire!!! I am getting some intense vains showing that i havent had before, like tricep and my bicep vain is getting SO much better! The visual effe t of my vains popping is a mental stimulus for me for getting pumped and workout harder!
Legs... they keep popping up from you guys as recommendations and i am trying my best! I have done legs the last 2 workouts with some good success's and failures.
Squats - Were a complete terrible fail! I started with the bar and then worked upto 95 pounds, i could not get close to 90 degree angle, and it felt like someone lined my left hip joint with razor blades... the pain was very uncomfortable...
Leg press - I also seem to surprise myself on it. I did just the sled for 5, 1 45 per side for 5 2 45's for 5 and then added another 25 for 3. I have been keeping the outsides of my feet touching the sides of the foot plate, and aligning my foot angle to correspond and keep in line with my knees and hips while i press. I was able to exceed 90 degress both days by quite a bit and went as low as the machine would allow on every rep. I am not going to increase weight beyond this until i can pump out some serious numbers and a few weeks of it with minimal hip discomfort. If all goes well i will take another stab at squats.

