Dafin Edison J

Dafin Edison J

Oct 23

Three sprints, real rest: how many reps a sprint test needs

#fitness #productivity #beginners #mentorship

3 min read

Dafin Edison J

Oct 22

Let your warm-up bar speed pick today's working weight

#fitness #productivity #beginners #mentorship

3 min read

Dafin Edison J

Oct 21

Which box should you drop from? Run a box ladder and let RSI answer

#fitness #productivity #beginners #mentorship

3 min read

Dafin Edison J

Oct 20

No coach, no partner: how to test yourself with two phones and a tape measure

#fitness #productivity #beginners #mentorship

4 min read

Dafin Edison J

Oct 19

Reaction, jump, sprint, lift: the order of a testing session

#fitness #productivity #leadership #mentorship

3 min read

Dafin Edison J

Oct 18

Update both phones before your next sprint session

#sprinttraining #speedtraining #coaching #trackandfield

3 min read

Dafin Edison J

Oct 18

Post the set, not a screenshot of the number

#velocitybasedtraining #weightlifting #coaching #athletedevelopment

3 min read

Dafin Edison J

Oct 16

One phone, one clip, a sprint time you can post

#sprinttraining #speedtraining #coaching #sportsscience

3 min read

Dafin Edison J

Oct 15

Film the feet: how to record a vertical jump you can compare every week

#verticaljump #sportsscience #athletedevelopment #coaching

3 min read

Dafin Edison J

Oct 15

Mean or peak: read the bar speed that matches the lift

#velocitybasedtraining #strengthtraining #weightlifting #coaching

3 min read

Dafin Edison J

Oct 13

A missed finish should not cost you a rep

#sprinttraining #speedtraining #coaching #trackandfield

3 min read

Dafin Edison J

Oct 12

Improved, held or dropped: the three answers a retest should give you

#strengthandconditioning #coaching #athletedevelopment #sportsscience

3 min read

Dafin Edison J

Oct 11

A sprint time only means something if the setup was the same

#sprinttraining #speedtraining #athletedevelopment #coaching

3 min read

Dafin Edison J

Oct 10

The fastest part of a sprint start happens before you move

#sprinttraining #speedtraining #athletedevelopment #coaching

2 min read

Dafin Edison J

Oct 9

RSI is two times, not a force plate

#coaching #sportsscience #jumptraining #strengthandconditioning

2 min read

Dafin Edison J

Oct 8

Stop the set when the bar slows down, not when the reps run out

#velocitybasedtraining #strengthandconditioning #coaching #weightlifting

3 min read

Dafin Edison J

Oct 7

A testing week should end in one spreadsheet, not forty screenshots

#coaching #athletedevelopment #sportsscience #strengthandconditioning

3 min read

Dafin Edison J

Oct 6

Jump power is only as good as the body weight behind it

#verticaljump #athletedevelopment #sportsscience #coaching

3 min read

Dafin Edison J

Oct 4

The coach roster is live on web and Android

#coaching #sprinttraining #speedtrackr #athletedevelopment

3 min read

Dafin Edison J

Nov 16 '25

I Built 20+ Free Developer Tools as a Solo Dev - Here’s How (and Why)

#showdev #productivity #tooling

2

2 min read

DEV Community

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Writing Debut

Three sprints, real rest: how many reps a sprint test needs

Let your warm-up bar speed pick today's working weight

Which box should you drop from? Run a box ladder and let RSI answer

No coach, no partner: how to test yourself with two phones and a tape measure

Reaction, jump, sprint, lift: the order of a testing session

Update both phones before your next sprint session

Post the set, not a screenshot of the number

One phone, one clip, a sprint time you can post

Film the feet: how to record a vertical jump you can compare every week

Mean or peak: read the bar speed that matches the lift

A missed finish should not cost you a rep

Improved, held or dropped: the three answers a retest should give you

A sprint time only means something if the setup was the same

The fastest part of a sprint start happens before you move

RSI is two times, not a force plate

Stop the set when the bar slows down, not when the reps run out

A testing week should end in one spreadsheet, not forty screenshots

Jump power is only as good as the body weight behind it

The coach roster is live on web and Android

I Built 20+ Free Developer Tools as a Solo Dev - Here’s How (and Why)