This cohort consists of university staff from the University of Alcalá, including both men and women, with varying occupational physical activity (OPA) levels.

This study does not involve a specific intervention but explores the relationship between leisure-time physical activity (LTPA) and occupational physical activity (OPA) in university staff, with a focus on work ability, musculoskeletal disorders, and quality of life.

Leisure-time physical activity refers to any physical activity performed during free time, not related to work or mandatory responsibilities. This includes activities such as walking, jogging, cycling, sports, or any form of exercise done for enjoyment, health, or fitness outside of regular occupational or household duties. LTPA is measured through Global Physical Activity Questionnaire (World Health Organization, 2001) that assess the frequency, duration, and intensity of activities performed during leisure time. It is an important determinant of overall health and well-being, with potential impacts on physical fitness, mental health, and work ability.

Occupational physical activity refers to the physical activity performed as part of an individual's job or work-related tasks. This includes movements such as walking, lifting, carrying, standing, or any other physical effort required by the nature of the work. OPA varies depending on the type of occupation, ranging from sedentary jobs with minimal physical exertion to physically demanding jobs that involve heavy lifting or manual labor. OPA is going to be assessed through Global Physical Activity Questionnaire (World Health Organization, 2001). It is an important factor influencing overall physical health, musculoskeletal health, and work ability. Understanding OPA can help identify how job-related physical activity influences worker well-being and performance.

Work ability refers to an individual's capacity to perform their job tasks effectively, considering their physical and mental health, skills, and work demands. It reflects how well a person's health and functional capacity match the requirements of their work. Work ability is influenced by various factors, including physical fitness, mental well-being, work environment, and personal characteristics such as age and job experience. In this study, work ability will be measured using the Work Ability Index (WAI), a validated questionnaire developed by the Finnish Institute of Occupational Health. The WAI assesses work ability through a series of questions related to perceived health, job demands, and the impact of health on work performance.

This variable refers to the frequency of musculoskeletal disorders (MSDs) and injuries related to work activities and daily life. MSDs are conditions that affect the muscles, bones, joints, tendons, and ligaments, often leading to pain and disability. These disorders can be caused or aggravated by repetitive movements, poor ergonomics, or physical strain in both occupational and non-occupational contexts. The Nordic Musculoskeletal Questionnaire (NMQ) will be used to assess the prevalence of these disorders, as well as injuries related to work and daily activities. The NMQ is a widely used tool for identifying and evaluating musculoskeletal symptoms in different body regions. In this study, the questionnaire will be adapted to the Spanish population, following the methodology proposed by Gómez-Rodríguez et al. (2020).

Age, sex, gender, BMI, place of residence, specific occupation, educational level, working hours, type of work shift, anthropometric characteristics, and, for women, whether they have entered menopause and since when. Optionally, marital status, annual income, and household tasks will be collected.