6:9
A study found that 6 second bursts with 9 seconds rest was an optimum ratio (1:1.5), with the added bonus that 6:9 burnt 3 times more fat ...
Read more »A study found that 6 second bursts with 9 seconds rest was an optimum ratio (1:1.5), with the added bonus that 6:9 burnt 3 times more fat ...
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