We are pleased to announce that on March 4, 2025, an updated Rich Text Editor will be introduced in the MyFitnessPal Community. To learn more about the upcoming changes, please click here. We look forward to sharing this new feature with you!

Could I be gaining muscle?

For the last 6 months, I have been exercising using a treadmill. But since the weather has gotten warmer, I've started swimming and keeping the treadmill routine going on days where it's not so hot.

The day after I swam for the first time, my lower back, arms and the back of my legs hurt really badly. I don't usually use those muscles when I'm working out, so that explains that. However, I stepped on the scales a few days afterward, I gained half a kilo! I have been eating normally and have had no changes to my diet whatsoever. Could I be gaining muscle?

Replies

  • mgermo
    mgermo Posts: 11 Member
    You cant gain 0.5kg of muscles in few swims. Besides that weight is normal weight fluctuation.
  • aimozz
    aimozz Posts: 27
    Fair enough. Thank you.
  • Sued0nim
    Sued0nim Posts: 17,456 Member
    Water weight from muscle repair, hormones or natural fluctuations - keep going it will drop
  • Cait_Sidhe
    Cait_Sidhe Posts: 3,150 Member
    When muscles are healing from exercise, they swell with water. Your weight gain is simply temporary water weight. Muscles require a surplus of energy to grow, you cannot grow muscles if you are eating a deficit. It is also extremely hard to grow muscles as a female.