What is your exercise regimen?

I'm middle-aged, so no activities that jar the bones for me any more. Just steady motion. Here is what I've been doing for the past 3 months with good results in strength and stamina.
Every other day, I walk at a good driven pace, 5 laps up and down my street. It calculates out to 3.1 miles and takes almost exactly 1 hour.
This is very good for the heart, lungs, legs, back, and overall stamina.
Every other day that I don't walk, I workout with dumbbells.
Which is very good for the heart, wrists, grip, forearms, bicepts, tricepts, shoulders, back, and abdominals.
I bought the solid one piece 20lb dumbbells at Wal-mart.
I like to do a variation of curls. Rather than curling with my palms up(traditional curl), I curl with my palms facing my side. The same way you would hold a suit case. I chose this method as it more similates the hand position when lifting boxes. From a standing position, as one arm is raising a weight the other arm is lowering a weight which keeps your posture well balanced. I lower one arm all the way down to fully extended along my side while the other arm is simultaineously bumping the top of my shoulder and continue this rhythm until each arm has completed 12 repetitions. This completes one set. I normally do 10 sets, which means each arm does 120 curls. I start a new set every 2 minutes and it usually takes about 25-30 seconds to do a set leaving a minute and a half to rest between sets.
The other exercise I do is the overhead press. Starting with both arms at my side, again holding the dumbbells the same way you would hold a suitcase. I raise both dumbbells simultaineously and position both just above my shoulders. Then in unison, I press both weights overhead/straight-up until my arms are fully extended over my head. Then I lower the weights back down to just above my shoulders and repeat. I normally do 15 repetitions per set. And I do 5 sets. Using the same 2 minute cycle to start each set which allows for plenty of rest between sets.
To further keep my arms as fresh as possible, I do two sets of curls and then one set of overhead press. Until all sets have been completed. To protect my lower back, I set up a folding chair in front of me so that I don't have to put much bend in my lower back picking up and setting down the weights.
All in all, I'm doing a combined 15 arm sets on a two minute cycle, so it only takes 30 minutes to complete.
Once I get on the road as a solo driver, I'll try to maintain this regimen as closely as time, weather, and energy will permit. I can use the first step of the truck to position the weights. And I'll modify the walking to a half hour a day if needed.
This is a fairly simple regimen that requires only: a decent pair of walking shoes,a set of dumbbells, and a little determination.

So, what do you guys do?

 

Being all steady motions, it really doesn't feel like exertion. Try it, you might like it. My wife recently joined me. She uses 15lb weights and looks forward to it. She works in a school kitchen and she says it is making her duties seem much easier.

 

I'm sure this winter weather severely reduces opportunity.

 

Thanks for your suggestions THD. I, like so many others, have had lower back problems for most of my adult life. So I have to be very careful with an exercise that involves much bending or twisting. The squats shouldn't be a problem but I do feel alot of strain on my lower back attempting standard pushups. The reason I do so many sets with the dumbbells is that it is a weight that I can fairly easily handle without using any body sway or excessive strain in the exercises. To get the results I seek in less sets, I'd have to increase weight which would also increase the possibility of injury. I choose not to take that risk.