Five minutes a day of consistent focused and mindful training makes a big difference. Four punches a second for 300 seconds 1200 punches.
1200 punches a day for a month 36,000 a month.
In a year in five minutes a day you are at 432,000 punches.
A weird thing happens, you get better and faster and in reality in 5 minutes a day you will in two years throw more than a million punches.
Skill improves, confidence improves, conditioning improves. A good experiment in using small bits of time to change your life.