The purpose of this study is to investigate the effect of exercise on the variability of intratumoral Natural Killer (NK)-cell infiltration in tumor biopsies taken before and after an exercise intervention in patients randomized to one of three study arms: I) High Intensity Interval Training (N=10) II) Moderate-Intensity Aerobic and Resistance Training (N=10) or III) usual care, prior to radical prostatectomy (N=10).