The other day, I ran 10 kilometers. The other day I ran 10 kilometers.

A comma isn’t necessary for so short an opening statement.

I thought I adopted the Jeffing, the Run-Walk-Run methodwas "Jeffing," ,a method where you run, then walk, then run again, but I read an article about Fartlek and realized what I did the other day resembled Fartlek. I thought I was "Jeffing," ,a method where you run, then walk, then run again, but I read an article about Fartlek and realized what I did the other day resembled Fartlek.

I adopted the Jeffing -> I was "Jeffing,": the -ing ending of "Jeffing" turns it into a gerund, as most words ending in -ing are gerunds (Gerunds are verbs ending with -ing; swimming, running, ending, etc). The current way the sentence is written is confusing because it doesn't consider this fact. the Run-Walk-Run method -> a method where you run, then walk, then run again: Even though it's more concise and is acceptable, it's more natural to explain a method that is unknown to the reader in plain words rather than more complex/compound explanations. *** ***it's also acceptable to say "a Run-Walk-Run" method, as it's less specific because the reader doesn't know if this is the ONLY run-walk-run method, or just one of many. Append the next sentence to this one.

I thought I would adopted the Jeffing, the Run-Walk-Run method. I thought I would adopt the Jeffing, the Run-Walk-Run method.

I thought I’d adopted the Jeffing, the Run-Walk-Run method. I thought I’d adopt the Jeffing, the Run-Walk-Run method.

I read an article about Fartlek and realized what I did the other day resembled Fartlek.

I read an article about Fartlek and realized what I did the other day resembled a Fartlek. I read an article about Fartlek and realized what I did the other day resembled a Fartlek.

However, a big difference is that Fartlek is thea Run-Jog-Run training method, not Run-Walk-Run. However, a big difference is that Fartlek is a Run-Jog-Run training method, not Run-Walk-Run.

However, athe big difference is that Fartlek is the Run-Jog-Run training method, not Run-Walk-Run. However, the big difference is that Fartlek is the Run-Jog-Run training method, not Run-Walk-Run.

The important point is that infor a Fartlek you should not make a plan. The important point is that for a Fartlek you should not make a plan.

You should start running and start jogging at random. You should start running and jogging at random.

Sometimes you may set a landmark, for example, to start running at athe next pole. Sometimes you may set a landmark, for example, to start running at the next pole.

verb corrections and article corrections

Sometimes you may set a landmark, for example, start running at athe next pole. Sometimes you may set a landmark, for example, start running at the next pole.

Or you decide on your instinctther times you just choose on the fly. Other times you just choose on the fly.

"Sometimes" is used in the previous sentence to describe a portion of the decision's circumstances, so "other times" should be used in the next that describes the other portion of the decision's circumstances.

Or you decide on your instinctrandomly. Or you decide randomly.

Or you decide based on your instinct. Or decide based on your instinct.

its common to use the phrase “based on one’s instinct”

I adopted this core idea when I started running and started walking the other day, and it was really fun. I adopted this core idea when I started running and started walking the other day, and it was really fun.

Append the next sentence to this one.

I adopted this corebasic idea when I started running and started walking the other day. I adopted this basic idea when I started running and walking the other day.

I adopted this core idea when I started running and then started walkjogging the other day. I adopted this core idea when I started running and then started jogging the other day.

Hopefully jogging otherwise it wouldn’t be a Fartlek?

It was really fun for me to do it.

It was really fun for me to do it this way. It was really fun for me to do it this way.