I exercise regularly (by virtue of my job), but I found that waking up at the same time every day helped greatly. My work switched to winter hours (so that we're still going to work with some modicum of sunlight), but I found myself still waking up at 6am regardless of whether my alarm was set or not.
In total I must have gotten 12 hours of sleep over the weekend due to family being in from out of town, but I still got up and worked a full day without an ounce of tiredness. It wasn't until around 10:30pm that my body demanded sleep.
I also noted that I have similar creative productivity at 6am as I used to at 1am when I was on night-owl hours. So I now use my extra morning time to get writing done that I find hard to get to later in the day.
Running is way more exhausting than weight lifting. If you're not exhausted, run faster and longer. You can't do the same with weight lifting. You can get your arms tired, but your arms will give up long before you run out of energy.
If you're lifting weights with your arms, you're probably doing it wrong.
Try the olympics lifts: power cleans and snatches and squat cleans and snatches. Or their components: deadlifts, front squats, presses. Or back squats and thrusters. Do a bunch of those in rapid succession and your whole body will be much more tired than doing a 5k run, guaranteed.
This is not my experience. After a couple you won't be able to lift anymore, but you won't really be exhausted either. At least I can't lift any more just because my muscles fail. I don't regularly lift weights though, so perhaps if you're more experienced you can. That said, you don't need experience to get exhausted running (but the tendency of many people is to stop long before that point).
Also, running on a track or anywhere that is not a treadmill is much more exhausting than using a treadmill. The treadmill does some of the work for you. It also makes you more prone to injuring yourself, as happened to me. In short, the are much better places to run than on a treadmill.
In total I must have gotten 12 hours of sleep over the weekend due to family being in from out of town, but I still got up and worked a full day without an ounce of tiredness. It wasn't until around 10:30pm that my body demanded sleep.
I also noted that I have similar creative productivity at 6am as I used to at 1am when I was on night-owl hours. So I now use my extra morning time to get writing done that I find hard to get to later in the day.