If I start riding an exercise bike for forty minutes a day, when will it show on my legs?

Yes. If you can ride 40 minutes a day your legs will tone. That is assuming you are spinning at 70+ rpm and you gradually increase the resistance. Your legs will tone. You will feel better.

it's not just the amount of time but the resistance. Constantly increase and decrese resistance. Also, standing on a stair with the tips of your toes and doing dips holding extra weight will help big time and you don't need to be at the gym.
You see big results in about 4-6weeks

Six weeks for first results and six months for real results I tell people who are starting off an exercise program.

Every day you bring a handfull of sand to your sandpile. Six weeks is forty handfulls.

Build a mountain of your own doing! Sounds as if you have the mental stength to do it riding 40 minutes a day. There is no failure in this equasion if you just bring a handfull of sand to your mountain every day.

And I agree with above poster: Spin don't mash! You want slim toned legs and not mashers legs. High RPMs!

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