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I have to admit that i don`t like massage especially on legs because it`s iritating and they start to cramp even more .
I drink a lots of fluid and vitamins ... i might start drink Mg or eat more food rich with Magnezium .
I understand. But, it's one of those things that can help in the long-term. Initially, you will get more cramped up which will be bothersome. But, when the fascia gets stretched out sufficiently over time (and is maintained that way through massage on a regular basis), it allows the muscles more room to lengthen and relax.
What happens over time from cramped or shortened muscles is that the fascia sheath around them shrinks, and then even when the muscle wants to relax it has no room. If you can get a lot of massage initially (like 3x a week for a month), then you should be able to maintain things with daily (or twice daily) stretching and a good deep massage once a week.
As for magnesium-rich foods, try the leafy greens, coconut juice (not coconut milk), sweet potatoes, artichokes (fresh ones -- just snip off the thorns, simmer for a long time in water with garlic, olive oil, and parsley -- magnifico!)
[An aside on leafy greens... be aware that
raw spinach actually
takes iron from your bones in order to get metabolized; spinach only becomes iron-rich when cooked. It's a little-known factoid. But, given the bone density reduction in paralyzed limbs, I wanted to not have that go unmentioned.]