I just finished a 6.39km running that lasted about 0hh:38mm:18ss !
This is what I call a "potpourri" Run, a mix of different pavements, paces and steeps, everything done in less than 40' covering all the aerobic spectre and running gestures, from sprints to jog and from flat to steep surfaces.
We have done a few intervals on stairs, doing skipping.
The high temperatures and humidity that we are suffering these days prevent us to run longer but, anyway, we have include some variations and different works which is always good.
Keep on running!
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