>>2720269If you are talking about the physical ability, there isn't really anything set in terms of 'you can do this, so you do this' beyond the obvious one (that you are ambulatory). Outside that the majority of these things are doable for you and it is just the same as anything else, Time x Intensity. Can always adjust the dial down, and for any exercise it's better to start with lower intensity first and build up.
>>2721033The issue with a regular backpack is primarily is that they aren't designed to be carry a ton of weight in a way that distributes it correctly to the body. Rucking is generally done with a back pack that has a proper waist belt or with chest rigs that hold the weight close to the body. Personally I'd rather just hike and maybe pick harder hikes. Or if you have a camping pack just pack up camping gear and day hike with it as a form of training.
Climbing has a process, training, and techniques that are designed to keep you Not Dead from some kind of traumatic brain injury. It's a lot of fun though. A local climbing gym is a great place to learn that stuff, meet people, and develop your abilities. Bouldering seems initially more accessible because there are no ropes. But as a result bouldering problems can usually be a lot harder, focusing a lot on skills and strength. Top rope climbing is faster to get into especially at an indoor gym. Great thing to try out.
2nd the biking idea. Even just a cheap road bike or cheap mountain bike depending on what you want to do. Endurance, strength, plus you get to go places. Easy to incorporate into other stuff just to increase daily activity level. If there are good bike groups in your area for the stuff you want to do, it can also be an great social activity. But it's also 100% doable completely on your own if you want that too.
