There isn't a single perfect English equivalent that captures all of the nuances of "swasam". However, here are some options you could use depending on the context:
* Self-breath: This is a literal translation that emphasizes the personal and internal aspect of the breath.
* Own breath: Similar to "self-breath", this highlights the personal connection to the breath.
* Breath of life: This emphasizes the vital and essential nature of the breath.
* Inner breath: This emphasizes the internal focus and awareness of the breath.
* Pranayama: This is a Sanskrit term that refers to breathing exercises in yoga, which often focus on "swasam".
The best English word to use will depend on the specific context and the meaning you want to convey.