Like any strength or resistance tool, weighted vests are safe when used properly and when following certain safety precautions. “Someone can use it to get stronger, or someone can accidentally harm themselves by using poor form and going too fast,” says Craig. “When you start using a weighted vest, make sure to ease into it. Do easy, 10- to 15-minute walking sessions with it, and see how you feel after a few days or a week. Then, you can start to increase the duration under load, safely.” A common beginner mistake is to choose a weighted vest that’s too heavy. People with any neck or back issues should consult their health care provider before using a weighted vest.