Although a lot of it depends on your current strength level and previous experience, we wouldn't advise training any given body part more than once every 5 - 7 days, especially if you apply more than one of the intensity - enhancing techniques described above. (fitnessandpower.com)
There are many different GST programs because they are usually specifically designed for each individual based on their current strength levels, experience and specific objective. (fitness-baron.com)
If you want to use them, you'll need to scale intensity to your current strength levels. (roughstrength.com)