The 12-3-30 is a treadmill workout that's harder than it looks. Some people might prefer it to running, but it's no magic ...
Lately, it seems like every 20-something is running a marathon. What was once a niche feat reserved for the elite and disciplined has now turned into an impulsive, oddly casual way for restless young ...
In simple terms, the 30-20-10 workout involves 30 seconds of low-intensity activity, 20 seconds of moderate-intensity ...
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