In this study the investigator would like to better understand how cachexia may improve or worsen, and how exercise may impact this process. The investigator would like to see whether a progressive resistance exercise program (EXCAP©®, Exercise for Cancer Patients) can improve symptoms in patients with gastrointestinal cancers with weight loss and cachexia. The investigator would also like to find out if this exercise intervention improves physical performance, day-to-day function, quality of life, and how exercise may affect different markers in the blood over time.
The main purpose of this research study is to determine if exercise improve or worsen cachexia.