BUT, I really am serious about this and frankly, I have no clue what the fuk to do.
Put 25lbs of weight in a backpack and walk a half mile.
2 days later, do a mile.
A couple days later go for 2 miles...
Once you are comfortable with that....start changing pace from brisk walk for 200 steps alternated by 200 quick shuffle steps.
Do not post any more threads about this fucking lame shit until you work up to 30lbs and can do 5-6 miles at a 15 min mile pace (giving you leeway due to age) with no discomfort.
Once you get there, start a new thread and I will give you next steps.
You have been given serious advice. Now fuck off and follow it.