You can perform these exercises on anything that safely allows you to hang at full stretch with your arms extended. (fitnessandpower.com)
The key to this movement is a slow and full stretch on your toes and lower your heels to get the full benefit of the stretch. (womenshealthandfitness.com.au)
The type of scratching product chosen should include upright posts that are tall enough to allow the cat to scratch at full stretch. (icatcare.org)