Coach Back

About Coach Back

Daniel Back is the founder of Jump Science.

How to Jump Higher

There’s a lot of information on this site and in the Jump Science posts on facebook and instagram. When I write, I try to give people actionable information. I hope […]

Achilles Strength (Bosch is wrong)

In a popular athletic development book, the author, Frans Bosch, cites force measurements in the achilles tendon of 3-6 x body weight (BW) in sprinting and 8-10 x BW in […]

Long Jump Case Study

In the athletic development field coaches often share general philosophies, models, ideas, etc. Someone might talk about things they consider when making decisions, but not share any actual data or […]

Dan Pfaff is wrong?

A quote from Dan Pfaff recently made the rounds through the athletic development community. Pfaff is obviously a great coach, and I do not intend to criticize him or judge […]

Recovery During a Hard Season

QUESTION: “hey I need some advice… So I’m homeschooled and my high school team plays a lot of games … we often play back to backs and tournaments we can […]

Squat Depth

In the discussion on transfer of training, squat depth is a hotly contested issue with many opinions clouding the view. On one side many people testify to superior strength and […]

Speed Training Periodization

QUESTION
…The main thing between me and my dream of playing D1 football is my physical abilities when it comes to speed and agility. I am not slow (4.65 40 hand-time), […]

Striking The Ground in Sprinting

QUESTION
I read somewhere that a major difference between people who are considered fast and those who aren’t lies in technique. It was written there that some of the people when […]

Speed Science

This is a video series on top speed. The videos will cover physics, biomechanics, sprinting technique, and training strategies. The first video covers the physics of top speed and the […]

Light vs Heavy Eccentrics and Structural Strength

QUESTION
I’ve been reading the book, Triphasic Training, by Cal Dietz… he trains each dynamic action separately starting with the eccentric phase of the movement. He uses submaximal and supramaximal slow […]