The beginning of every workout should start with

Stretching. Without stretch before a workout, you can overdo your body, tear muscles and not be loose enough to do whatever workout you are planning to do; (dance, swimming, weight lifting, etc.) Stretching also clears the mind and gives a yoga like status to your body, giving you a good mindset while working out. It also gets your blood pumping and your muscles looser. Hope this helps! :)

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat