i dont, but iv seen people do weighted sprints and jump rope. i could even see it being beneficial to wear it out to go hiking with the family or something, as an added workload
I love my vest. I wear a 15lb vest when I run on the treadmill at home. Sometimes I'll leave it on and wear it while cleaning the house or working in the yard.
We use them with our Autistic Children in the class room and in therapy. If you need to add body weight in the gym...just hang some chains around your neck.