Running

I'm gonna go for a run now and I'm just starting again after an injury (marching foot) definitely gonna try running on my forefoot to see if it helps. If you take your shoes off and run, it's natural to run on the forefoot, so I'll give it a go.

NO NO NO!!!

It's only "natural" to forefoot strike when running barefoot because you're running on hard surfaces and you're using your calves to absorb the shock. running in shoes, the shoe (and the pronation of your foot after heel strike - rolling in) absorbs the shock, which is FAR more effective at normal running speeds. running on your toes will completely fuck your calves and achilles tendons, it's NOT a natural way to run. It's a very FAST way to run, but it's also very very hard on your body. there is a reason why racing flats and distance racing spikes have a heel!

yes, forefoot running is the "natural" way if you would do without shoes but be careful. if your body is not used to it you will get injured quite easily as your calves and achilles tendons have to do massive work and it gets worse the heavier you are.
these elite runners weight even less than road cyclists so a neutral mid foot running is not bad to start with. don't want to come across patronizing but went through a string of injuries caused by changing to a more "fashionable" forefoot running style too quickly.

forefoot running is fine and dandy if you're a 58kg african who can knock out a 28 minute 10k... if you're not a lightweight with amazing technique and insane fitness it's just a fast track to calf and achilles tendon injuries!

there is NO WAY someone who is just starting running will be able to do more than a couple of hundred metres striking on their forefoot, it's just asking for severe calf pain, achilles tendon injury or a metatarsal stress fracture.

the natural way for almost everybody to run distance is to strike on your heel, pronate naturally and toe off.

as Claus said, he had a string of injuries from trying to do it the other way. speaking as someone who spent 10 years burning around the track on his forefeet (note - this was a trained athlete doing fast middle distance training, not a beginner going for a long run) and waking up every morning with shooting pain in his achilles, feet and calves, I'm pretty confident that this is not something you want to do if you're just starting.

get some properly fitted shoes and start slow using a conventional heel striking technique. much safer.