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Hey,I was hoping someone could guide me or provide advice into how to get back into shape as it feels like an insurmountable wall at the moment. I used to be incredibly active as a teen, spending all day skateboarding and playing soccer, but at some point I became an addict, a smoker and just holed myself off in my house for 15 years now. I've quit vaping and am working on getting clean and have been trying to start taking care of myself better. My father who has helped me through all this is a long time marathon runner, and he's got a few years left. Before he stops running I'd like to get in good enough shape to run a 5k or half marathon with him as a surprise. The problem I have now is, before I even get to a point where I feel like I'm building muscle, my lungs and throat feel like they are on fire, breathing is hard, and I can become shaky and nauseous and my heart is going to explode from my chest. How do I get to a point where I can stop worrying about my heart exploding or lungs hurting so bad I have to stop? Unfortunately I live in the US and I'm lower income, so health care is not really an option, I have to opt out of job provided health insurance to pay the bills.
EDIT: Just to clarify, I don't need to lose weight, I eat decently healthy and am pretty thin, about 130-135 at 5 foot 6. I can walk with no issues – I took an 8 mile walk the other day and it was a little tiring due to the heat, but I could easily do it every day. The big thing for me that I want to focus on is when I do something that speeds up my heartrate or gets my breathing heavily, it hurts my lungs and throat so bad.