Provider referral, self-referral, and contract referral are three strategies used to inform past partners of possible sti infection.

"Provider referral, self-referral, and contract referral are three strategies used to inform past partners of possible STI infection."---This statement is a FACT.
 There are three main approaches to partner notification, for notifying sexual partners of those with confirmed STI.
1. Patient-based referral’, or patient referral (often self-referral )
2. Provider referral which involves a third party in notification.
3. contract referral which is also known as conditional referral

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.