He's baaaack!

Rob Kardashian is back on social media AND back in the gym! Of course the latter is the important part ... the male contingent of the Kardashian clan has been in hiding for almost TWO YEARS as he went through splitting with baby mama Blac Chyna and the subsequent revenge porn claims from Ms. Chyna and apparently he kept overeating during these past two years.

Rob's had trouble with his weight for years -- in fact he claimed it was the reason he didn't show up to Kim and Kanye's wedding in Italy five years ago. He flew to Europe and then hopped a flight and came back because he had anxiety about appearing in a tuxedo among Hollywood's most glamorous people and not being up to par.

Well now he's ready to get on the treadmill again, as he posted this photo of his home gym on Monday and captioned it, "Day 1 all good," with a strong of muscle and pregnant woman emojis!

We hope the regimen sticks this time, Rob! We'd like to see you back in action!