Thank you, Jahnavi. That helps, though I have not heard the term "hara line" before.
I am familiar with "hara", that is the Japanese word similar to "tandien", what we inadequately describe as "center".
If I had to guess, I'd say the hara line follows the path of the Microcosmic Orbit, from root to crown via the spine, and back down the front through the body's energy centers, what most of us know as the "7 chakras".
"Forceful" is the wrong nuance, given your description. It does sound like it's more conscious intervention than "basic" Reiki.
Maybe I'll try this tonight on myself, seems intriguing!
Thanks again,
Blessings,
Aronaya