Chаrlie Rоnzоllа is аn avid runner. He has been training fоr a 50 mile ultra marathon scheduled in two months! He ran this weekend and slipped on some wet Mardi Gras beads causing him to sprain his deltoid ligament. His injury was three days ago and is receiving physical therapy. He is partial weight bearing per doctor's orders but due to pain he is ambulating non weightbearing. Which of the following exercise would not be appropriate for this phase of healing?