There are many methods and formula that have been devised and tested, and they all can give good results if done wisely.
For example, there is HIIT (high intensity interval training), and regular interval training.
I think that HIIT might increase strength more quickly, but it can be EXTREMELY tiring, and is perhaps more likley to cause injury.
An advantage of doing intervals with structured times for 'work' and 'rest' is that makes it easier to track your results and see how performance is changing when you also measure the speed or power that is done in the work sections.
The important thing is to DO the training on a regular basis (x times per week). And to be very careful to avoid injury.
Jay Kosta
Endwell NY USA