An overlooked benefit of sticking to free weights is that, unlike with machines, when you travel 1 kilogram always equals 1 kilogram.
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Also gain much more stability and control with free weight

Watch out for dodgy barbells, they sometimes vary in weight by 5-10lbs.
Except that hotel gym in the US, where I had to convert everything from lbs to figure out whether I was slacking off or just jet lagged!
You take your weights with you travel? OK, better than a whole machine, but still, damn!
Weights have gotta be the biggest scam.
In prison we would fill up plastic bags with water.