Vicious circle

The PAX travel single-file around the bases of a baseball field. The last man (or last 2 men in larger groups) peels off, runs to the pitcher's mound, performs 5 of an exercise, and then rejoins the PAX at the front. Repeat this for all PAX. Change the mode of travel and the exercises accordingly.

For example: PAX bear crawl around the bases. The last man moseys to the pitcher's mound for 5 Merkins and then returns to the front of the PAX. Or, PAX lunge walk around the bases. The last man moseys to the pitcher's mound for 5 jump squats and then returns to the front.