So I've kind of figured out something that works pretty well to build fitness as you get older, maximizing explosive strength, and endurance of such, while minimizing impact on your joints. I'm only 38 but with over 2k days on skis on these knees longevity is definitely on my mind.
The basic principle is building endurance into your fast twitch muscle fibers, which some people say isn't really possible, but they're wrong.
The more detailed version is that balance training, although it doesn't build a lot of muscle, works your fast twitch muscles. If you do large volumes of balance training, but mix in just a bit of explosive and strength training, it builds that endurance into your strength explosivity etc.
What this looks like in terms of exercises, is I do my squats as 3 separate super sets while balancing on the flat side of a bosu ball. Basically before and after I do my squats, I do a few minutes one legged yoga on the flat side of a bosu ball, jumping off with one leg and landing on two legs on the dome side of another bosu ball when I'm done. Then the squats are also done balancing on the flat side of a bosu ball, in typically in a large superset that consists of sets of 12, 10, 8, and 6. Mixed in between these, while still on the bosu ball, I do sets of a dozen different shoulder and back exercises. I do three of these supersets a day. They're always the same 12 10 8 6 squats, but the first of the day is a 5lb dumbell in each hand, with 20 reps each of the shoulder and back exercises. The next two can vary a bit but are typically something like 12 reps each of the upper body stuff with 12lb dumbells, and the this is 10 reps with 12.5 lbs dumbells.
In between every single exercise I do a log roll on a foam roller. So three times a day I do one leg yoga on a bosu ball, jump off with one leg landing on two legs on another bosu ball, then log roll, and repeat this process on the other leg. Then squats and upper body for roughly 15 minute super set while balancing on a bosu ball, jump off, landing on another bosu ball, lunges, log roll, then repeat the one legged bosu ball yoga/jump/log roll on each leg.
So while you're under load doing strength training while balancing for 15 minutes straight, and also working in explosive strength with the jumps, and endurance of fast twitch muscles with the log roll, the overall strain on your joints is minimal.
Often I feel more bounce in my step after working out than before.
Of course theres also cardio, pushups, abs, etc and I do my two legged yoga poses like warrior, etc with each foot on the dome side of a bosu ball, and I also do the log roll between all those things, but this is the meat of my daily workout and I can just feel so much more energy endurance and explosivity from it. No matter how tired I am I retain a lot of strength to maintain correct form when skiing biking running etc and no matter how tired I am, I always feel like not only can I keep putting one foot in front of the other, but always have just a bit more gas left in the tank for explosive strength left as well.
You don't have to do the exact same stuff, but I've found the principle to be very sound. Especially as we get older, the balance reaction time etc become harder to maintain. One note, from what I know you should always do squats on the flat side of a bosu ball. The dome side is great for jumping onto, and other things, but if you do squats on the dome side, your posterior chain will fail to activate, leading to weird imbalances and knee pain in the long run.
I hope this helps someone.
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