CW - magnesium is no miracle cure for anything other than magnesium deficiency. Always worth googling something like "magnesium muscle cramp myth" before falling for these sort of things in future....unless you were magnesium deficient of course? You'll often find, amongst the blogs written by health enthusiasts citing amazing benefits, a scientific study of previous research which concludes no benefit.
When you get a drug that REALLY works, like iboprofen, or penillicin, the effects are massively overwhelming in every test done. The best you'll ever get with these crank ideas like magnesium is "in a recent study, 10 % of respondees showed a 5% increase in recovery time...." Ie, if it works it hardly works.
However, if you are magnesium deficient then it's a different matter of course.
Dachs - you are sounding like Justin Bieber when he wrote in the Ann Frank House visitors book that "If she were still alive, I'm sure she'd be a Belieber".
But maybe that's not as fanciful. Maybe Samir is Caravaggio reincarnated? He was a maverick right enough, had a bitter artistic rivalry with another painter of the day (Carracci) and liked to throw down the gauntlet to other rivals in even more dramatic style (usually involving swords and daggers) - although he did almost conform in the end when he joined a club (The Knights of Malta) - but that was less about getting to run in track races and more about getting off a murder charge.
Not sure whether Samir hangs out with whores and drinks to excess - although his 4am bedtime on friday was an encouraging sign and his difficulty breathing at the Parkrun may be the first signs of syphilis which (possibly) took Caravaggio's life.