I am self-taught in terms of trigger point therapy, having had my share of ills. I learned from reading and using as reference 2 books:
The Trigger Point Therapy Workbook by Clair Davies
Trigger Point Therapy for Myofascial Pain by Finando and Finando
Best $40 I have ever spent! I also have various “tools” like tpmassageball and their rollers, foam roller (on its way as we speak), Theracane and The Stick. All are helpful in self-treatment. As is a good sports massage therapist who is versed in trigger point work, which is close to ART, which I love getting, but it’s been just as effective for me to work on myself during stretching sessions, and an ART therapist recently confirmed that what I’m doing is just as good.
Trigger points in glute muscles refer on down back of the leg, depending on which muscle they originate in. Sciatica can be caused by trigger points in piriformis, but in my experience, by the time the piriformis gets jacked up there are other muscles involved, like QL, glute medius, iliopsoas.
Pain around SI joint is commonly referred from trigger points in iliopsoas and piriformis muscles. It’s fatigued iliopsoas muscles that tend to cause low back pain in runners and cyclists, which is why they are the very first muscles that I stretch after a long run or ride.
When you’ve identified a trigger point, yes, you work on that area, but you need to find the originating and participatory muscles. There’s usually more than 1 muscle involved in any myofascial problem. Anyone who tells me about low back/piriformis/hamstring usually finds they have iliopsoas involvement. ITBS starts with a tight ass (!). Knee pain is problems in the quads, and unattended gastroc/soleus issues can develop into Achilles tendonitis. Soleus trigger points can refer pain UP the leg as well.
I have found that doing supplemental strenghtening exercises for the iliopsoas, abductors and adductors seems to help, too.
You start with basic trigger point work, and then as you get good at it, you learn to stretch the muscle as you are attacking the trigger points, which is just shy of ART. For some muscles you can do it to yourself (see the tpmassageball site–it shows some examples); for really bad or hard-to-reach, you might need assistance.
Iliopsoas is tough to work on by yourself, but the first of the 2 books shows how, and a good sports massage therapist will be able to position you to dig in on it. If it’s bad, then massage work is a good idea. Once you get it loosened up, though, with regular stretching it should be fine.
Regarding kick sets–if you are using a regular old hard kickboard, it tends to put your back in a hyperflexed position, which strains your back muscles in the area of the SI joint, so it’s not surprising that giant kick sets aggravate things. You might want to switch to a kickboard that keeps your back in a less hyperflexed position, or ditch the kickboard for awhile and just kick on your side or on your back.