Ross Jeffs

Sprints, Jumps & Hurdles Coach. Aspire Academy🇶🇦

[LTAD Network @ltadnetwork]

NEW WEBINAR 🌟

🗣️ @ross_jeffs — ”Classifying Chaos: A new framework for plyometrics”
📅 Sunday 14 June, 5pm BST

Ross will be exploring a modern approach to understanding and organising plyometric training beyond traditional models

Secure your seat:

🔗 https://t.co/OhkLCQOnkl

[Ross Jeffs @ross_jeffs]

@jamesbaker_8 @Aspire_Academy @PhilipGrahamSm2 @LeeChristopher7 @Marco_Cardinale @BarryShillabeer @millsy011 @ChrisBrandner @KennyMcMillan76 @brock_athletics All the best Bakes

[Ross Jeffs @ross_jeffs]

@d_andradesport @LucyStevoJSY @SportcastJersey @JerseySport @JerseyFA @JerseyBullsFC @JerseyRFC @Jersey_Hockey @jerseyrowing @JerseyNetball @cricketinjersey Hi Dan, is the indoor athletics facility still in the works?

[Jonas Dodoo @EatSleepTrain_]

For years coaches and scientists have used terminology to describe the different types of runners.

Step Length vs Frequency

Pushers vs Pullers

Concentric - Elastic - Metabolic

Our friend and former employee @ross_jeffs does a good job discussing this with @JustFlySports

[Ross Jeffs @ross_jeffs]

@PierreSamozino @bigk28 Sure if you are talking about the whole 30m effort.

But at that point in the run where the highest net horizontal force value was "worse" (∼0m) the velocity behaviour at that point would also have to have been "worse" as well, no?

[Ross Jeffs @ross_jeffs]

@lahti_johan @bigk28 It doesn't, rate of change of acceleration isn't independent of velocity either, it's just a second derivative of it?

[Ross Jeffs @ross_jeffs]

@bigk28 My concern is with the net force and power numbers it is dressing up velocity and overcomplicating it.

Without force plates and seeing step to step kinetic values they are pretty meaningless.

[Ross Jeffs @ross_jeffs]

@lahti_johan @bigk28 Acceleration is not independent of velocity. The calculation is Δv/Δt

[Ross Jeffs @ross_jeffs]

@bigk28 For sure it was a simple example, essentially I am trying to understand what is the difference between using a velocity time/distance graph and calculating the slope of a FV curve, how does the latter provide more value?

[Ross Jeffs @ross_jeffs]

@bigk28 Of course is doesn't but all these metrics are just reflecting the behaviour of velocity.

Ultimately if someone runs a faster 0-5m split/ has a greater velocity at 5m and all else stays equal in the 30m run we know their slope has shifted.

[Ross Jeffs @ross_jeffs]

@lahti_johan @bigk28 "And that can either take place by the max velocity component improving and/or the force improving."

In this instance with net force being calculated from velocity surely there is no way Power can improve from just force increasing and not velocity.

[Ross Jeffs @ross_jeffs]

@sprintcoachSWE Have you ever looked at “hopto jumps”

[Ross Jeffs @ross_jeffs]

@TomDruce @alex_natera @SportsmithHQ Jersey legend Tom Druce ! Nice work

[Ross Jeffs @ross_jeffs]

@mboyle1959 @SportsmithHQ @tom__turner @christombs71 @PaulComfort1975 @josephcoyne @lachlan_wilmot @JonathonWeakle1 @balsalobrephd @jacedelaney @A_Hudy @DrTSuchomel What evidence is there to say that just because you are training at peak power output (or equivalent) that it is the best training stimulus for improving peak power output.

To improve maximal strength would you select an exercise and load that displays the highest Fz production?

[Ross Jeffs @ross_jeffs]

@EatSleepTrain_ @NFL @chrisolave_ @coachrgrubbs @les7spellman @SpeedworksBath @Tier1athlete @breakawaydata Ofc shook in a good way! I was punning Mobb Deep, nonetheless great content. Keep it coming.

[Ross Jeffs @ross_jeffs]

@YoucefZatat I thought @DuqueminZ beat both those athletes selected, what is the point in having a trials if it didn't matter?

[Ross Jeffs @ross_jeffs]

@JerseySport @faudes99