It is recommended to consult your physician or physical/occupational therapist prior to attempting these exercises to ensure that any underlying health conditions are not compromised.
Sitting in an office for long periods of time can cause muscles and joints to become tight and sore. Therefore is it a good idea to move on regular intervals to prevent muscle tension, shortening of tissues and adopting poor postures.
If possible (and if you are not already) get out the chair and go for a walk every hour for a few minutes. Set a timer to remind you. See Apps.
Understand that muscles lose strength and tone without regular exercising and although these exercises are meant to help prevent certain forms of discomfort and injury, they are no substitution for pursuing an active lifestyle.