Physical activity measurement, and environmental determinants of PA and health. Dynamic relationship between motor skill competence (actual and perceived), physical activity, physical fitness, and overweight/obesity.

In his professional activities, he interacted with 500 collaborators in co-authorship of scientific works.
He supervised 2 doctoral thesis, and 14 master's dissertation and co-supervised 4.
He was a visiting professor in the PhD program in Physical Activity Sciences at the university Catolica del Maule, Talca, Chile (2018), and was visiting research in the research project “Valoración de la salud ósea de niños y adolescentes que asisten a centros escolares estatales de la provincia de Arequipa” at the University Nacional de San Agustín, Arequipa, Perú (218, 2019)
Participated as a researcher in 4 projects.
https://investigadores.anid.cl/es/profile/residence_postal_address?u=1

His research work has focused on the issues of habitual physical activity, physical fitness, and motor development on children and youth. He has published 160 articles in specialized journals. It has 39 chapter of books and 17 books. He has 83 publications indexed in web of science. He presented several lectures (more than 100) at scientific conferences.
His more recent research agenda focuses on promoting the acquisition and development of fundamental motor skills and the association of motor competence with physical activity, health-related physical fitness, perceived competence, and obesity across the lifespan. His research emphasizes the need to address and understand developmental mechanisms and casual pathways related to youth physical growth and development and trajectories of physical activity and obesity. In this topic several papers were published (27). On this topic he published a paper (Doi: 10.1111/j.1600-0838.2009.01027.x.) that was of great importance for international research, we will not be exaggerating if we consider this article as seminal for research on this topic. He collaborated as coauthor in a systematic review (DOI: 10.1007/s40279-015-0351-6) which was also of great importance for scientific community.
In the 2007 till 2009 period, he implemented an intervention program and research project that provided regular physical activity and physical exercise for obese and overweight children, with the aim of studying the effects on body composition, physical fitness, motor competence and habitual physical activity, resulting in a PhD thesis and 4 master dissertations.
He was an invited speaker in several scientific meetings, as was a keynote speaker in meetings in University of South Carolina, Columbia, SC, USA, and in UFRGS in Porto Alegre, Brazil in 2016.
As a reviewer 2019 he received an award of Excellence in Reviewing for the Journal of Motor Learning and Development from The North American Society for the Psychology of Sport and Physical Activity. In 2020 received public recognition from the Research Center in Sport, Health and Human Development (CIDESD) for participating in an important research project Outstanding R&D Project “TECH - Technology, Environment, Creativity and Health”.