A recent study determined that intense aerobic exercisers (like runners) can recover their breath and bring their heart rate down more quickly doing this:

Rest your hands on their knees versus holding their hands overhead. Check out this infographic for more tips on healthy running! 

#healthyrunning #handsonknees

Source: https://bmcmusculoskeletdisord.biomedcentral.com/articles/10.1186/s12891-015-0486-5