The traditional formula is:

220 minus age (ie 60 minus equals 160)

at 70 percent for training effect (70 plus 48 equals 118 beats per minute)

Climb the stairs - you will arrive before most elevators.
A great, passion filled orgasm will put both of you into the zone.
Mimic a 6-18 month y.o. EVERY movement for 20 minutes.

Find joy...in nature and count the birds, trees, clouds, for a 20 minute walk and compare today, to yesterday, to tomorrow.