to do for the challenge. Squat with shoulder fly - hold dumbbells and take arms out from side and up as far as you can go. Do that for set number or for time on specific days.
Lunge with overhead press - step out, press up, then back up and step out with other side. Do both legs for # of step outs.
Wide squat with Tricep kickback - spread feet just past shoulder width and turn feet out a little, holding arms in at side press weights (dumbbells) back until arm is straight but not hyperextended or locked.
Stay down in squat positions until all movements are completed.