Recent research published in BMJ found that regular physical exercise appeared to bolster the efficacy of Janssen’s (NYSE:JNJ) Ad26.COV2.S COVID-19 vaccine. While the vaccine was 60.0% effective against hospitalization in individuals with a low activity level, efficacy climbed to 85.8% for those with a high activity level. Efficacy was 72.1% for individuals in the moderate activity group.…