I do ~12,000 steps/day and HIIT 3x/week but I have trouble incorporating weight lifting primarily because I can do the other two without needing a gym, which is very difficult (single dad, 2 kids, sole caretaker, 2 businesses). Any suggestions?
A quick summary: No gym, lifting is at home 3 days per week of 30 minutes each day. First form a habit, any kind of exercise will do. Sounds like you’re there. Once lifting, keep it compact and accessible, start with just a bench and adjustable dumbbells. He also only does a few minutes at a time, not a half hour block. Eat some protein.
Here's the ones I use [1][2].