Dumbbell and treadmill

Added dumbbell, a item held in hand that can be used to burn some fat. Can be used faster the more it is used consecutively.
Added treadmill, a placed item that functions as a conveyor belt (activated with a switch too), that burns some fat of people moved by it

GainStation13/code/modules/gym/gym.dm

@@ -0,0 +1,115 @@
+/obj/item/dumbbell
+	desc = "A weighty dumbbell, perfect for arm exercise!"
+	name = "dumbbell"
+	icon = 'GainStation13/icons/obj/dumbbell.dmi'
+	icon_state = "pen"
+	item_state = "pen"
+	throwforce = 20
+	w_class = WEIGHT_CLASS_BULKY
+	throw_speed = 2
+	throw_range = 3
+	materials = list(MAT_METAL=10)
+	pressure_resistance = 2
+	var/reps = 0
+	var/using = FALSE
+
+/obj/item/dumbbell/dropped(mob/user, silent)
+	reps = 0
+	. = ..()
+	
+/obj/item/dumbbell/attack_self(mob/user)
+	. = ..()
+	if(!using)
+		using = TRUE
+		visible_message("<span>[user] does a rep with the [src]. YEEEEEAH!!!</span>")
+		if(do_after(usr, CLICK_CD_RESIST-reps, 0, usr, 1))
+			if(iscarbon(user))
+				var/mob/living/carbon/U = user
+				U.adjust_fatness(-10, FATTENING_TYPE_WEIGHT_LOSS)
+			if(reps < 16)
+				reps += 0.4
+		else
+			visible_message("<span>[user] couldn't complete the rep. YOU'LL GET IT NEXT TIME CHAMP!!!</span>")
+		using = FALSE
+
+/obj/machinery/conveyor/treadmill
+	name = "treadmill"
+	desc = "A treadmil, for losing weight!"
+
+/obj/machinery/conveyor/treadmill/convey(list/affecting)
+	var/turf/T = get_step(src, movedir)
+	if(length(T.contents) > 150)
+		return
+	for(var/atom/movable/A in affecting)
+		if((A.loc == loc) && A.has_gravity())
+			A.ConveyorMove(movedir)
+			if(iscarbon(A))
+				var/mob/living/carbon/C = A
+				C.adjust_fatness(-10, FATTENING_TYPE_WEIGHT_LOSS)
+
+/obj/machinery/conveyor/treadmill/attackby(obj/item/I, mob/user, params)
+	if(istype(I, /obj/item/crowbar))
+		user.visible_message("<span class='notice'>[user] struggles to pry up \the [src] with \the [I].</span>", \
+		"<span class='notice'>You struggle to pry up \the [src] with \the [I].</span>")
+		if(I.use_tool(src, user, 40, volume=40))
+			if(!(stat & BROKEN))
+				var/obj/item/conveyor_construct/treadmill/C = new/obj/item/conveyor_construct/treadmill(src.loc)
+				C.id = id
+				transfer_fingerprints_to(C)
+			to_chat(user, "<span class='notice'>You remove the conveyor belt.</span>")
+			qdel(src)
+
+	else if(istype(I, /obj/item/wrench))
+		if(!(stat & BROKEN))
+			I.play_tool_sound(src)
+			setDir(turn(dir,-45))
+			update_move_direction()
+			to_chat(user, "<span class='notice'>You rotate [src].</span>")
+
+	else if(istype(I, /obj/item/screwdriver))
+		if(!(stat & BROKEN))
+			verted = verted * -1
+			update_move_direction()
+			to_chat(user, "<span class='notice'>You reverse [src]'s direction.</span>")
+
+	else if(user.a_intent != INTENT_HARM)
+		user.transferItemToLoc(I, drop_location())
+	else
+		return ..()
+
+/obj/item/conveyor_construct/treadmill
+	icon = 'icons/obj/recycling.dmi'
+	icon_state = "conveyor_construct"
+	name = "treadmill assembly"
+	desc = "A treadmill assembly."
+	w_class = WEIGHT_CLASS_BULKY
+	id = "" //inherited by the belt
+
+/obj/item/conveyor_construct/afterattack(atom/A, mob/user, proximity, click_parameters)
+	SEND_SIGNAL(src, COMSIG_ITEM_AFTERATTACK, A, user, proximity, click_parameters)
+	SEND_SIGNAL(user, COMSIG_MOB_ITEM_AFTERATTACK, A, user, proximity, click_parameters)
+	if(!proximity || user.stat || !isfloorturf(A) || istype(A, /area/shuttle))
+		return
+	var/cdir = get_dir(A, user)
+	if(A == user.loc)
+		to_chat(user, "<span class='notice'>You cannot place a conveyor belt under yourself.</span>")
+		return
+	var/obj/machinery/conveyor/treadmill/C = new/obj/machinery/conveyor/treadmill(A, cdir, id)
+	transfer_fingerprints_to(C)
+	qdel(src)
+
+/datum/design/dumbbell
+	name = "Dumbbell"
+	id = "dumbbell"
+	build_type = AUTOLATHE
+	materials = list(MAT_METAL = 2000)
+	build_path = /obj/item/dumbbell
+	category = list("initial", "Tools")
+
+/datum/design/treadmill
+	name = "Treadmill"
+	id = "treadmill"
+	build_type = AUTOLATHE
+	materials = list(MAT_METAL = 5000)
+	build_path = /obj/item/conveyor_construct/treadmill
+	category = list("initial", "Construction")

tgstation.dme

@@ -3112,6 +3112,7 @@
 #include "GainStation13\code\modules\food_and_drinks\recipes_bigpizza.dm"
 #include "GainStation13\code\modules\food_and_drinks\objects\candy_flora.dm"
 #include "GainStation13\code\modules\food_and_drinks\recipes\recipes_ported.dm"
+#include "GainStation13\code\modules\gym\gym.dm"
 #include "GainStation13\code\modules\hydroponics\grown\berries.dm"
 #include "GainStation13\code\modules\mob\living\emote.dm"
 #include "GainStation13\code\modules\mob\living\emote_modular.dm"