Reddit mentions of Super Joints: Russian Longevity Secrets for Pain-Free Movement,

I've read so many books that I honestly cannot say that any particular one is the most important. However, here's a list of really good ones:

• Starting Strength. Mark Rippetoe. I've read all three editions. The books have greatly influenced the way I lift, especially in the obvious sense of proper form for barbell lifts.
  
  
• Practical Programming For Strength Training. Mark Rippetoe and Lon Kilgore. Simple explanations of a lot of things related to training even nutrition.
  
  
• Beyond Bodybuilding. Pavel Tsatsouline. Amazing book filled with numerous lifts with the goal of using strength training to develop mass.
  
• Relax Into Stretch and Super Joints by Pavel as well. If you have issues with mobility or flexibility, these books are awesome.
  
• 5 3 1. Jim Wendler. I'm fairly certain the majority of people know what this is, but if you haven't read it, I encourage reading both editions and the one for powerlifting, especially if you're running 5/3/1 right now. All three books are a huge resource for determining how to program assistance and conditioning.
  
• Easy Strength. Pavel and Dan John This was a great read. It was filled with tons of things from articles written by Dan John as well as just a massive look at how to appropriately program strength training for people at numerous levels.
  
• 4 Hour Body. Tim Ferriss. This was an amazing read. It, like Pavel's Power to the People, was a great read on complete minimalism of training towards a goal.
  
  I've read so many more books than that. Since these are the only ones that I can think of off the top of my head, I'd say that they are the ones that have made the biggest impression from reading them.

If they are concerned about your joints, perhaps picking up Saint Pavel's book, Super Joints, and adding those drills to your morning routine will help, especially if you do the drills with them?

I am going to guess that you are a teenager and living at home, thus your parent's conerns have more impact on your life than they might otherwise. Do your research about the long term benefits of strength training. Performing your prayers as a teenager actually helps build up your bone density and can protect you from breaks up to your 70's. Adding muscle mass when you are young also protects you as you age.

Possibly, also, finding articles about aged body builders (such as the gentleman in India who just passed away at 104 years of age), and talking about how the leading indicator of mortality in the elderly is a lack of muscle mass- regardless of other health concerns.

If their concerns are really for your joints, ask them to join you on your joint mobility drills. Be cautious of your knees, mine are long gone and I miss them- my right knee is in nearly constant pain, so that is a very valid concern, as a parent, but there is much bad information out there on how our prayers are bad for joints. They are not. If you do, and present your research well, hopefully your parents will respect that you are making an informed decision.

Science! followed by some Older Science!