Rob Kardashian has reportedly been very consistent in working out, sparking speculations that he could be preparing for a 2015 comeback in "Keeping Up with the Kardashians."

According to reports, the former reality star has regularly been working out with celebrity trainer Gunnar Peterson.

"Rob is always in!" Gunnar Peterson reportedly told People. "He's slammed schedule-wise and still makes this work. Never worry about Rob."

As it turns out, Rob Kardashian has also been turning work out time into quality family time.

"He's even been working out with Kylie Jenner and Tyga, as we can see from Rob's Aug. 24 Instagram," Hollywood Life reported.

"He's also been working out with sis Kim Kardashian, who tweeted on Aug. 14: 'Just went on the hardest hike ever today with @robkardashian' and shared again on Aug. 25: 'Rise & Grind! Workout time!!!!! With @robkardashian.'"

Is this an indication that Rob Kardashian will be having a television comeback this 2015 for "Keeping Up with the Kardashians?"

It has been previously reported that Lamar Odom also wants to get back into his NBA physique before 2015 ends, and he's allegedly encouraging Rob Kardashian to take the challenge with him.

"Lamar and Rob had a special bond when Lamar was married to Khloe and Rob was crushed when they got divorced, but that brotherly love never went away," an insider told Dish Nation.

"Khloe [Kardashian] is 100 percent on board with Lamar's plan. She adores her brother and knows how much he loved Lamar."

Rob Kardashian has been avoiding the public eye amid purportedly suffering from depression and weight gain. The only Kardashian brother reportedly chose to stop participating in his family's reality show, "Keeping Up With The Kardashians." He has also missed a lot of family events including Kim Kardashian's wedding to Kanye West.

Rob also missed yet another 2015 Kardashian-Jenner shindig this month - Kylie Jenner's birthday party.