Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
Biological females aged 18 years or older. Currently working in an office job with at least 75% of the working day spent sitting (sedentary work).
Must report a regular menstrual cycle (cycle length 21-35 days) for at least the past 6 months.
Able to attend all scheduled intervention sessions (8 sessions over 4 weeks). Able to provide informed consent to participate in the study.
Exclusion criteria
Use of hormonal contraceptives or other hormone-containing therapies (e.g., Intrauterine Device (IUDs), patches, birth control pills).
Pregnancy, current breastfeeding, or planning pregnancy during the study period.
Menopause (natural or surgically induced). Diagnosis of a severe chronic disease (e.g., heart failure, insulin-dependent diabetes, diagnosed neurological disorder).
Active cancer or history of cancer within the last 5 years. Current diagnosis of a major psychiatric disorder (e.g., major depressive disorder, bipolar disorder).
Current use of psychotropic medications that could significantly affect Heart Rate Variability (HRV) (e.g., certain beta-blockers, anti-depressants).
History of recent surgery (within the last 3 months) in the neck or upper extremities.
Participation in another clinical trial simultaneously.