Ok so the manga is still strange as fuck but FINALLY the characters are actually sounding like people and not aliens. If the manga was about them only going forward I think it would jump massively in quality.
They are different sides of the same coin in outlook and quirkiness. That unifying factor of competitiveness and truly loving to sculpt the body, not just work out, is weirdly compelling. Plus there is this semi-lesbianic undertone which brings up the themes of lust v. admiration v. obsession v. dedication. Honestly, the moment the chapters focused on their workout together, everything started to flow and settle into a groove instead of whatever the fuck was happening before.