I think it's safe to assume Saitama isn't actually "going all out", considering his table flip doesn't even begin to compare to the combined serious punches. But I could be wrong tho,
Zombieman seeing Saitama use the Serious Table Flip (Webcomic redraw), by me. : r/OnePunchMan
Serious Table Flip - One Punch Man Chapter 167 Fan Animation - Saitama vs Cosmic Garou - YouTube
Table flipping the whole moon - 9GAG
Serious table-flip colored by me. : r/OnePunchMan
One-Punch Man: Saitama's New Killer Move 'Serious Table Flip' Just Totalled the Moon - FandomWire
Can Luffy tank the force of serious table flip ? - Battles - Comic Vine
One-Punch Man: Saitama's New Killer Move 'Serious Table Flip' Just Totalled the Moon - FandomWire
Future Serious Series Fanart! (Spoilers) : r/OnePunchMan
How powerful is Saitama's serious table flip? - Quora
SERIOUS TABLE FLIP ANIMATED - YouTube
One-Punch Man: Saitama's New Killer Move 'Serious Table Flip' Just Totalled the Moon - FandomWire
Pin by severlaeel on OPM | Fan art, Abstract artwork, Table flip
Serious Table Flip - Omnidirectional Serious Punch | One Punch Man Fan Animation - YouTube
Saitama vs Garou, Saitama use Serious Table Flip( One punch man new chapter) - Bilibili
Saitama's Serious Table-Flip by Jigmetenzin on DeviantArt
Serious Series: Serious Table Flip | Fandom
Serious Table Flip (One Punch Man) by Kirito352 on DeviantArt
T-Rex sized Raptor on Twitter: "his most serious move so far has been that he crouches down, plunges his fingers into the ground and goes: "Super Move: Serious series. Serious Table flip"
One punch man Animation | SERIOUS TABLE FLIP - Bilibili