"One's internal medicine training" refers to the specific education and practical experience a medical doctor goes through to specialize in diagnosing and treating diseases that affect different organs and systems within the body. Full definition
Dr. Horowitz received her medical degree from Yale University School of Medicine, where she graduated Alpha Omicron Alpha; she completed two years of internal medicine training at the University of Chicago Hospitals and both her adult psychiatry residency and child and adolescent psychiatry fellowship at Columbia University. (lifespan.org)
Short - tracking in a field like internal medicine (historically the most popular choice for future physician - scientists) means trading off a year of general internal medicine training for more time as a subspecialty fellow. (sciencemag.org)
The American Board of Internal Medicine Research Pathway requires residents to complete 24 months of internal medicine training followed by 12 to 24 months of clinical subspecialty training (depending on the subspecialty), and at least 3 years of research training. (sciencemag.org)