They can work for newer trainees who are comfortable following written workout instructions. Choose exercises and resistance appropriate for your current ability, and consult a qualified professional before beginning if you have an injury or medical concern.
Equipment needs vary by program. Review the individual product page before purchasing to make sure the plan fits the equipment you have available.
Fit In 15 Minutes is the most natural starting point when limited time is the main barrier. The 12 Week Shred is better suited to someone ready for a longer, more structured commitment.