@rainbowdreamer One thought I have about being athletic yourself and hoping that a cattle dog fits into that is... a lot of times it doesn't. I'm super active, but my rescued ACD can't do the vast majority of sports with me that I hoped she would.
I had hoped she would want to run alongside my bicycle, but she doesn't. She isn't a good running/jogging companion because she's so focused on sniffing every 3 second. She doesn't like to swim (she will wade). Wont chase a ball or frisbee. Loves hikes but gets hot really easily, so for many months on end per year it's a no-go. Isn't a good "gym dog" because she hates loud noises and won't relax. Can't be anywhere where a skateboard might show up or bicyclist might come near.
I think it's crucial to realize that an ACD's #1 thing is being with their people. Mine actually won't let any one walk her but me. She won't leave my side willingly, and if I leave her she doesn't want to go away from the last place she saw me (and won't be led away from that spot, aka home, by anyone trying to take her on a walk). When I travel, she definitely misses me (and I miss her!).
Another thing is, they aren't happy go lucky when it comes to dealing with anything outside of the household. More like worry warts... this means that adventures with them are very possible, but also can be stressful. But at home the loving nature and goofball nature is so sweet and funny.
I love love my cattle dog more than anything, but leaving her behind when traveling kills me and taking her with me can be stressful unless the situation is very controllable and flexible.