Answer:

Dr. K suggests to just substitute with household items you have handy. Think weight or shape, depending on the exercise and equipment.  For example, you can use a text book in place of a med ball if it weighs the right amount and you’re doing a press.  On the other hand, you might choose a basketball if you’re doing push ups on the med ball.

Household items, in many ways, are better to use than gym equipment.  It’s more natural training.  Also, I have many clients that do these workouts with their bodyweight alone and get fantastic results! Here are a few more examples:

Abs on the ball - Ideally, and safely, you’d be hanging off of something so you can hyperextend.  Some people are able to do this with a couch or bed by hooking their feet on a fixed surface.  Others may have a Bosu ball at home, which is a great substitute.  Lots of people do this exercise on the floor - since it just helps sculpt your abs, you’re not going to miss out on too much here by using the floor.

Biceps Curls & Presses - Try a text book, or gallons of water in each hand, filled with water, sand, pebbles, or anything else you want to create the ideal weight.

Bosu Ball - sub in an exercise ball if you decide to get one or use the floor.  

Medicine ball - sub in dumbbells or a round, firm object like a basketball when weight bearing.

*Results may vary. Please read our full disclaimer here