I am a 21 years old male, around 1.80 cm and 72 kg.
I study at college so I spend most of the day seated, I try to keep a good posture but if I spend a lot of time seated I end up having bad postures and my lower back aches from time to time. I especially feel this if I don't do any kind of physical exercise. I've been told that strengthening the muscles of my back would help me.
I usually swim and it's quite effective but I will spend most of this month travelling and I won't have access to a swimming pool. I would like to do some kind of physical exercise to keep up during this month. I have tried doing some bodyweight exercises like Freeletics and I was looking for something like that.
What kind of bodyweight exercises would you recommend me to gain strength in my back?