Hi, I've just started cycling about a week ago for 30 minutes each day. Because I have horrible stamina, I have to split the 30 minutes into two sessions, 15 minutes in the morning and 15 at night. So, I wanted to start losing more weight so I tried to go 20 minutes full burst all the way, but my legs got sooo sore and I was just so exhausted! Any advice for increasing my stamina or how to not get tired so easily? Thanks!! ((I cycle using a bike machine))