Difference between 尽管 and 虽然 In this sentence should I use both 尽管/虽然 or not? 

I really like doing sports. Although I have many lessons every day, after four o'clock I'll be in the gym running and swimming. My friend Maria even likes to practice taijiquan with the master.

我很多喜欢运动。尽管/虽然我每天都有很多上课，但是下午四点以后去体育馆跑步，游泳。连我朋友玛丽也喜欢跟老师打太极拳。

The hotter it is, the better I feel. But even though it's very hot these days, I think I got a flu and my head hurts more and more.
天侯越热身体越好
尽管/虽然 这些天很热但是我感冒了头越来越疼
Grammatically ,尽管 and 虽然 two words are no essential difference.

Both 尽管 and 虽然 are right to place in XX.


  我真的很喜欢运动。 XX我每天都有很多的课，但四点以后，我還是會在体育馆跑步和游泳。 我的朋友玛丽亚甚至喜欢跟大师练习太极拳。
  
  天气越热，我感觉更好。 但是，XX这几天天气很热，我还是觉得自己得了流感，而且头部越来越痛。


The emotion of 尽管 is stronger than 虽然.So it is often to see us use 虽然.